Characters / All of Us Are Dead

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Year 2 Class 5

Nam On-Jo

Nam On-Jo

Played by: Park Ji-Hu

Dubbed by: Yume Miyamoto (Japanese), Victoria Grace (English), Desireé González (Latin American Spanish)

Debut: Episode 1

She is a student at the Hyosan High School and the daughter of a firefighter. She is the protagonist of the show.

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• Action Survivor: She does anything in her power to survive and protect others despite being a small-framed girl. And thanks to her dad being a firefighter, she's got some really handy survivor skills.
• Adaptational Personality Change: In the webtoon, On-jo is mature, responsible, less interested in romance and is more willing to engage alone in a fight with a zombie, while her show version is childish, tomboy and takes the role of The Heart in the group.
• Adult Hater: The army refusing to rescue her and her friends, leaves a bitter taste in On-jo's mouth, coming to believe the adults are either cowards, or completely useless.
  On-jo: No. I won't ask the adults for anything...ever again in my life.
• Anger Born of Worry: When Cheong-san disappears for a time to recover a phone.
• Audience Surrogate: Out of all the teen main characters, her reactions and skills are largely limited to what a teenager could actually do during a crisis of any sort.
• Belated Love Epiphany: On-jo realizes she loved Cheong-san the whole time only after his assumed death.
• Belligerent Sexual Tension: She constantly fights Cheong-san.
• Big Eater: Cheong-san's mother serves the group a lot of fried chicken, since she knows On-Jo eats a lot. On-Jo replies that it's not "a lot", just that she "eats well".
• Book Dumb: She is not particularly interested in studying.
  Nam So-ju: Hey, you won't get good grades anyway, so don't stress about it.
  Nam On-jo: Don't give up on me, dad. I can do it.
  Nam So-ju: I'm not giving up, I just have no expectations.
• Break the Cutie: She starts as an outspoken and upbeat person, but the zombie virus outbreak make her experience multiple loses, leaving her traumatized. On-jo avoided her own friends for months because she didn't want to be reminded of the events.
• Brilliant, but Lazy: Smart enough to come up with plans, but On-jo just canot bring herself to study a little bit more, despite all the promises to her father.
• Broken Bird: By the end of the season, she becomes jaded, not only because she lost many people she cared about, but also because the zombie virus outbreak and nobody coming the save them, reveal to some ugly truths about the human nature, especially the adults.
  On-jo monologuing: I already knew the sorrow of being a survivor. But I didn't know just how heavy that sorrow would be.
• Childhood Friends: She and Cheong-san know each other since kindergarten and are even referred by others as being best friends.
• Clingy Jealous Girl: Tries to get between Nam-ra and Su-hyeok, and treats Nam-ra very cold and harsh because of her jealousy.
• Cynicism Catalyst: She loses her hope in the adults after the army refuses to save her and her friends.
• Daddy's Girl: Her father absolutely adores her and is the only adult she trusts to save her.
• Explain, Explain... Oh, Crap!: When the group is trapped on the rooftop and they start sharing their life stories around the firepit, Ji-Min reveals that she had the opportunity to transfer to a school in Seoul, but she wasn't sure about abandoning her friends, so she took On-Jo's advice of skipping school for five days so she wouldn't have the recommendation anymore, to which On-Jo starts to make a victory sign with a slight smile on her face... until Ji-Min continues and says that she and her parents would be safe away from Hyosan if she had transferred by then, to which On-Jo slowly lowers her hand without saying anything.
• Fire-Forged Friends: With Nam-ra despite initially considering the latter a romantic rival, hating her for her stand-offish nature, and having opposing approaches to navigating the zombies, They warm up to each other enough that On-jo becomes one of the first people who gives Nam-ra the benefit of the doubt after she is bitten by Gwi-nam. By the end of the season, their friendship has grown so much that she plans on searching for Nam-ra after seeing a fire lit on top the school ruins.
• First Kiss: With Cheong-san just right before his supposed death.
• Gotta Pass the Class: She has the low grades in exams and struggles to pass the class.
• Girl Next Door: Of the tomboyish type. She and Cheong-san lived next to each other in an apartment complex.
• Green-Eyed Monster: She is very jealous over Nam-ra and Su-hyeok because she has a crush on the latter.
• Guile Heroine: Yang Dae-Su believes that while she may hate reading books, she is quite clever.
• The Heart: She is the most prone to believe in friendship. When she decides to go alone to find Nam-ra, everyone who survived the high school of dead instantly follows her.
• Heterosexual Life-Partners: With I-sak, who was On-jo's best friend.
• Hopeless Suitor: She tries anything to impress Su-hyeok, like Letting Her Hair Down, giving him her name tag, stumbles on the stairs in front of him, and even during the zombie outbreak, On-jo still tries to draw his attention to her. Su-Hyeok has eyes only for Nam-ra and hooks up with her.
• I Let Gwen Stacy Die: She feels very guilty over Cheong-san's presumed death.
• Innocently Insensitive: On-jo asks Cheong-san of all people if he has any idea about what Su-hyeok thinks of her, after she invited him on a date.
• Jerk with a Heart of Gold: She can be quite rude and immature, but damn if she's not gonna fight a horde of zombies to protect her friends.
• Letting Her Hair Down: A variation, she usually wears her hair in a Tomboyish Ponytail, but tries to wear her hair down several times in order to impress Su-hyeok, a guy she likes. And she asks Cheong-san if she is prettier like this, her best friend who has a secret crush on her.
• Like Father, Like Son: On-Jo takes after her father's survival skills, having learned from him basic things like making a temporary toilet separated from the main area during an isolated scenario, and having the same taste in food regarding Cheong-san's mother's chicken.
• Military Brat: She is the daughter of a former Master Sergeant.
• Missing Mom: There is not a single mention of On-Jo's mother on the show, not even if she is dead or divorced.
• Mistaken for Romance: The entire high-school mistakes On-jo and Cheong-san's Platonic LifePartnership for a couple. On-jo gets really pissed off whenever someone calls her Cheong-san's girlfriend. Cheong-san on the other hand, doesn't mind that much because he really has a crush on her.
• Non-Uniform Uniform: She wears a white-cream hoodie over her regular uniform.
• Oblivious to Love: She had no idea that Cheong-san harbored feelings for her for more than a decade.
• The Protagonist: Most of the plot revolves around her even if the other characters have their own subplots that have nothing to do with her.
• Plucky Girl: She is very determined to survive and fight the zombies despite being utterly afraid of them.
• The Smart Girl: Her father's a fire fighter, so she knows most of the practical survival skills useful to the group. She also is the first to correctly surmise that Nam-ra is somehow immune (she's actually an asympomatic carrier) to the virus by determining Cheong-San and Su-Hyeok's respective stories about Gwi-Nam. She wisely notes that neither of them have any reason to lie.
• Staircase Tumble: On-jo intentionally stumbles on the stairs in front of Su-hyeok, thinking that if she seems vulnerable in front of a strong guy like him, she will attract his attention, except that Su-hyeok just looks at her puzzled without doing anything.
• Tomboy and Girly Girl: She is the tomboy to I-sak's girly girl. Cheong-san and Gyeong-su treat her as one of the guys, according to Cheong-san's mom, she eats a lot, and takes a lot from her father's survival skills.
  • As being both the female leads, On-jo has this dynamic with Nam-ra too, who is a quiet and introverted Book Worm.
• Tomboy with a Girly Streak: She is considered One of the Boys, but is interested in things like chasing someone romantically or wearing makeup.
• Took a Level in Cynic: On-jo goes from the social and upbeat girl to someone stoic, bordering on the loner given that she avoided her friends for 3 months after making it to safety. At least, all her of experiences left her more insightful than the ignorant girl she used to be.
• Troubled Fetal Position: On-jo has an emotional breakdown after her father's death and hides her head in her knees.
• Tsundere: She doesn't want at all to acknowledge that she cares a great deal for Cheong-san whether is platonic or romantic and becomes very defensive if someone tries to point it out. On the other hand, every time he is in danger she is the most worried about him. Cheong-san tried to get her to admit that she in fact, cares for his well-being, only for On-jo to tell him she is very angry with him.

Lee Cheong-san

Lee Cheong-san

Played by: Yoon Chan-young

Dubbed by: Yūki Shin (Japanese), Harrison Xu (English), Jesus Mondragon (Latin American Spanish)

Debut: Episode 1

Classmate and long-time neighbor of On-jo.

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• Always Save the Girl: Is incredibly protective of On-jo, even before the outbreak.
• Anguished Declaration of Love: During the campfire on the rooftop where everyone made confessions, Cheong-san finally admits his feelings for On-jo, but she rejects him because she has no idea how to react to a such confession.
• Ascended Extra: In the webtoon, Cheong-san is just a side character with little screen time; but in the show, he takes Nam-ra place as the Deuteragonist of the story and is archenemies with Gwi-nam despite never meeting each other in the webtoon.
• Badass Normal: He is fast, agile and has one of the highest zombie body-counts in the show.
• Badass in Distress: Cheong-san often gets himself into situations where he could easily be swarmed by the zombies, which continually worries On-jo and Su-hyeok.
• Bash Brothers: Whenever it comes to do something dangerous, Su-hyeok will always accompany Cheong-san, or the other way around.
• Batter Up!: Cheong-san choses a baseball bat to fight off the zombies when he and the group get out of the gym store.
• Belligerent Sexual Tension: He constantly fights On-jo.
• Bros Before Hoes: Even though On-jo has a crush on his friend, it doesn't affect their friendship at all. He even receives advices from Su-hyeok on how to gain On-jo's affection. Too bad Su-hyeok doesn't see the things the same way when it comes to Nam-ra.
• Cathartic Scream: The Martial Law is implemented seconds before he can use the phone to call for help. When Cheong-san realizes the phone is not working, he screams and cries.
• Childhood Friend Romance: With On-jo.
• Childhood Friends: He and On-jo have known each other since kinder garden and are even referred by others as being best friends.
• Combat Parkour: Cheong-san jumps around and performs gymnastics-heavy moves in order to hit the zombies.
• Combat Pragmatist: He makes a good use of his surroundings in order to fight the zombies.
• Deadpan Snarker: He is good at making sarcastic comments.
  On-jo: Lots of geniuses go crazy.
  Cheong-san: Well, at least you won't have to worry about going crazy.
• Despair Event Horizon: Comes very near to it after seeing his mother in her zombified state. He attacks his own friends and Su-hyeok has to restrain him.
• Eye Scream: Provokes one to Gwi-nam with a phone. Later, Gwi-nam pays him in same manner.
• Eating the Eye Candy: A PG-example, he admires On-jo's looks when she asks him her hair best looks when parted. Then calmly tells her to get lost right after.
• First Guy Wins: Cheong-san is the first guy On-jo met, since they know each ither since kinder garden. She starts to harbour feels for Su-hyeok, but Su-hyeok has feelings for Nam-ra. On-jo returns his feeling right before his presumed death.
• Fragile Speedster: Cheong-san mostly relies on his agility in combat, but if goes against powered zombies like Yoon Gwi-nam he is no match for them.
• Genre Savvy: He is the first to realize that the zombies behave like those from the Train to Busan movie.
• The Gadfly: He loves to tease On-jo to get her attention.
• Heroic Sacrifice: After being bitten by Gwi-nam, he runs to the top of the building to attract the zombies' attention so his friends can get to safety. Thankfully, this also lures Gwi-nam to him instead of the others as Gwi-nam would have seriously impended their escape. It's unknown if the two truly died however.
• I Shall Taunt You: Cheong-san films with the smartphone and calls Gwi-nam a gopher for other bullies after the latter slashed the principal's throat. It backfired on him in the worst way possible, by being bit and infected by Gwi-nam as well as losing his eye to him..
• Jack of All Stats: He is not as efficient of a fighter as Lee Su-hyeok, nor does he have On-jo's survival skills, Nam-ra strategic mind, or Yang Dae-su's Stout Strength, but makes up for it with his parkour skills. He is also skilled and smart enough to improvise on the spot.
• Near-Death Experience: To the point of being a Running Gag.
  • In the cafeteria where he was saving On-jo.
  • He almost dies trying to escape to the broadcasting room.
  • When he gets separated from Su-hyeok and is chased by zombies.
  • Gwi-nam constantly tries to kill him. He may have succeeded at the end. May.
• Never Found the Body: After Hyosan district is bombed, On-jo returns to the construction site in hopes of finding any sign of him. Neither his nor Gwi-nam's body is seen.
• Patient Childhood Love Interest: Gender-Inverted. He grew up together with On-jo and had been in love with her for 12 years, since kinder garden. They develop Like Brother and Sister relationship, although the school considers them a couple. Cheong-san always treated On-jo as One of the Boys, instead as the girl she is, pushing On-jo to never consider Cheong-san harbouring feelings for her. She develops a crush on Su-hyeok, a good friend of him, and tries to be girly all the time around him.
• The Protagonist: He is the main character alongside On-jo, until his supposed death in the penultimate episode.
• Single-Target Sexuality: This guy has been in love with the same girl for over a decade.
• Staking the Loved One: He is the one who throws Gyeong-su, his best friend out of the window, after he got zombified.
• Uncertain Doom: Due to his lack of fear, resailance to defeat Gwi-nam, the fact he's never seen turning into a zombie (nor is he body ever seen) and he used Gwi-nam as a shield from the flames, many believe he's alive as a Hambie. Take note he only showed one symptom that Lee Byeong-chan (who became a Hambie) also showed; a nose bleed.
• Unlucky Childhood Friend: He had feelings for On-jo since they were small children, but she always refused to take that in account and just assumed he sees her as one of his 'guy-friends'. Than On-jo develops a crush on one of his closest friends.

Choi Nam-ra

Choi Nam-ra

Played by: Cho Yi-hyun

Dubbed by: Ayaka Asai (Japanese), Grace Song (English), Cynthia Chong (Latin American Spanish)

Debut: Episode 1

She is the studious class president of Class 2-5 and a top student, known for her cold attitude.

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• The Ace: She is the top student of the Hyosan High School.
• Action Girl: After getting bitten by Yoon Gwi-Nam and becoming half-zombie, she fights off the zombies, and saves the group twice from Yoon Gwi-Nam.
• Adaptational Personality Change: In the manhwa, Nam-ra embraces her role as a leader and is proactive from the very beginning. Here, she is passive-aggressive instead of amiable and confident, and hates her role as Class President because the others seek her out only when she is needed.
• The Aloner: Nam-ra chooses to go in a self-imposed exile after realizing she will just lose more and more self-control and may end up attacking her friends. Subverted, she finds others like her during the 4 months skip and befriends them and promises to regularly see her group.
• Aloof Dark-Haired Girl: She is a beautiful raven-haired girl with a poised disposition. Her case is deconstructed though, she is aloof because she always feared having friends, while her classmates avoided her because they interpreted her introverted attitude as a sense of superiority.
• Always Someone Better: Oh Joon-Yeong confessed that he always hated Nam-ra because no matter how hard he worked, she was simply better than him at everything.
• Badass Bookworm: She doesn't participate just with the brain, but also fights the zombies herself.
• Battle Couple: She always interferes when Su-hyeok is in trouble, especially when he was fighting Gwi-nam.
• Beauty Is Never Tarnished: Despite fighting zombies, being thrown around or slammed to the ground countless times, her clothing remains just as neat as always, and her hair stays clean and brushed. The contrast is even more powerful when all meaningful characters have bruises, blood all over them, and their clothing is torn apart. Is quite symbolic in Nam-ra's case, because it represents her flawless pristine image that she was never allowed to break.
• Beware the Quiet Ones: Nam-ra may be introverted and quiet most of the time but she is not a pushover. She is very blunt and sharp-tongued when she has anything important to say and had no problem bitch slapping Na-Yeon once she realized the latter infected Gyeong-Su.
• Brainy Brunette: She has long black hair, is The Ace of her High School, and her knowledge often proves useful against zombies.
• Break the Cutie: She breaks down badly by the end when she almost succumbs to the virus and can't control herself anymore.
• Broken Ace: She may be the best student, but it came at the cost of her personal life. She only chose to become the best because of her helicopter mother.
  Nam-ra: I was too scared my grades would drop and my mom would get mad. So I didn't do anything else. I was too scared to make friends. My mother would always ask me what rank they were in the class, what their parents did, how big their house was...
• Broken Bird:
  • As much as a teenager can be with an overbearing and a verbally abusive mom for whom their children are never good enough. It was bad enough for her to start smoking at the age of 13/14 just to cope with the stress of trying to keep her mom satisfied.
  • After the zombie outbreak, it's even worse with all the trauma she had to endure.
• Brooding Boy, Gentle Girl: Gender inverted, but otherwise the golden couple for this dynamic. Lee Su-Hyeok is popular, sociable and courteous, while Nam-ra is introverted, quiet and aloof.
• Classical Anti-Hero: She may not be the most social person, but she is most certainly heroic and selfless.
• Class Representative: She was chosen the class leader because of her mother's donation to the school, but she never cared about her status, and her peers always mocked her for being the class leader.
• Creepy Monotone: Her stoicism and quiet façade come across as this due to her becoming partially zombified.
• Death Glare: Nam-ra will take her time to just stare silently at someone when she is angry. When On-jo interferes in an argument between her and Na-yeon, Nam-ra doesnt take it lightly and stares for a minute In-Universe at On-jo, who is shown to be intimidated.
• Defrosting Ice Queen: She opens up and becomes more talkative as the series progresses.
• Eerie Pale-Skinned Brunette: Whenever she goes into zombie mode, her left eye gets reddish, making the already pale Nam-ra look very unsettling.
• Elite Zombie: She is one of the few, along with Gwi-nam and Eun-Ji, to be infected with a mutation of the virus. She doesn't show symptoms, keeps her sentience, has Nigh-Invulnerability to major injuries, but still hungers for human flesh. Unlike the other two, Nam-ra is the only one who successfully fights off the urge to bite her friends, and has the logical choice of remain in Hyosan to keep her friends safe.
• Friendless Background: Enforced since she always refused to make friends for various reasons. Although that changes by necessity due to the Zombie Apocalypse.
• Foreshadowing: In episode 7, when Nam-ra looks at the camcorder, the bloodstains on the screen overlap just above her forehead and her left eye. After becoming an Elite Zombie, Nam-ra's left eye becomes reddish from the virus and later she hits her forehead and injures herself when she succumbs to the virus.
• Go-Getter Girl: Her only preoccupation before the virus outbreak, was to be the perfect student.
• Headphones Equal Isolation: She is introduced using earphones so she wouldn't have to speak to others, giving the impression of being a snobbish Alpha Bitch, when in reality she was just bad at socializing. Su-hyeok once told her that using headphones that often would be bad for her ears. In contrast, much later during the outbreak, Su-hyeok makes her an improvised paper buds to protect her ears after the zombie virus gives her increased hearing, making her sensitive to loud noises.
• Heroic Sacrifice: She is willing to jump out of the window for people she barely knows just to avoid putting them in danger.
• Heroic Will Power: The show puts a lot of emphasis on the fact that the virus' will to survive is stronger than the will or intelligence of their host. This only highlights Nam-ra's struggle to remain herself.
• Hidden Depths: She breaks the flawless impression everyone had about her by confessing she has been smoking since the 8th grade.
• I Choose to Stay: She leaves the group for good after she unwillingly attacks On-jo, because she doesn't considers them safe around her anymore.
• The Immune: Netflix Korea released a video about zombies, stating that Nam-ra is immune to the virus and cannot spread it to others.
• Lonely Rich Kid: Nam-ra is a resident of a rich neighborhood where Na-yeon also lives, which means she is at least upper class.
• Loner-Turned-Friend: As traumatic as the Zombie Apocalypse is, it helped her finally get some friends in her life.
  Nam-ra: I never thought I'd get a change to sit around a fire with all of you like this. It's really nice. It's my first time. If we somehow manage to get out of here, I really hope we could make a fire and hang out like this again.
• Knight Templar Parent: Nam-ra implies that she has a helicopter mom who would have torned apart the school looking for her. Unlike most examples, the show has a very realistic portrait of how stressful and emotionally draining it can be for a child with an overbearing parent, whose offspring is not trying hard enough to meet their expectations.
• Misunderstood Loner with a Heart of Gold: Nam On-Jo, Kim Ji-Min and others acknowledged they used to hate Nam-ra for her apparent superior attitude, but after getting to know her better, they realize she was always a good person, just very introverted.
• Mythology Gag: In the show, Nam-ra still wears her iconic white bandage over the eye, but for different reasons. In the webtoon, Choi Nam-ra is attacked by a zombie, injuring her right eye, but in the show, Lee Su-hyeok wraps the bandage around her left bloodshot eye because the survivors could become afraid of Nam-ra.
• Nice Girl: She is actually very helpful and selfless, despite her introversion and seemingly cold attitude.
• No Good Deed Goes Unpunished: When she tries to save Lee Su-Hyeok from Yoon Gwi-Nam, the latter bites her, turning her into a half zombie. After that incident, no matter what she does or says, almost everyone becomes instantly fearful of her.
• Not So Stoic: Although she presents herself as distant, this demeanor quickly dissipates as she is shaken by the deaths of her classmates.
• Passive-Aggressive Kombat: Being a loner who is often wrongly judged, Nam-ra developed a passive-aggresive defense mechanism.
• Perpetual Frowner: Nam-ra's default face expression.
• Raven Hair, Ivory Skin: She has a pale complex and shiny pitch black hair. Several characters consider her attractive and Lee Su-Hyeok tells her he finds her pretty.
• Sherlock Scan: She is very good at observing small details. She was able to deduce that Han Gyeong-Su was healthy the whole time despite his injury, and that he became a zombie only after Lee Na-Yeon treated his wound with an infected handkerchief, Lee Na-Yeon's reason being her hatred for his "welfie" status.
• Single Woman Seeks Good Man: She has feelings for Lee Su-Hyeok, one of the bravest characters in the show.
• The Smart Gal: When it comes to theoretical knowledge, she has the expertise. She is The Strategist of the group. She came up with a plan to use music to lure the zombies in order to empty the hallways, save Cheong-san and then to leave for the rooftop.
• Sour Outside, Sad Inside: On the surface she's a poised young woman with no time for stupidities. Beneath the surface, she's an introverted and fearful girl with mommy issues.
• Spoiled Sweet: Nam-ra is one of the rich kids in the show, and her mother is the parents' president, but she never uses her status to flaunt it in the face of others like Lee Na-Yeon, her other rich neighbor. She does gets misjudged as a Rich Bitch simply because she is shy and aloof.
• The Stoic: At first, she is very aloof and barely reacts to what is going on around her. This changes shortly after as the ordeal goes on.
• Super-Hearing: Deconstructed, Nam-ra becomes prone to Sensory Overload from hearing too many noises in the same time, provoking her headaches, rendering her unable to help and even needing protection herself.
• The Quiet One: Nam-ra is so taciturn that saying five words is an actual conversion on her part.
• Tainted Veins: Sometimes, when the virus is trying to take control of Nam-ra, reddish veins appear on the left side of her face, leading to Facial Horror.
• Uptight Loves Wild: Has a crush on Su-hyeok, a reformed bully.
• Violently Protective Girlfriend: Do not harm Su-hyeok in her presence, ever.
• When She Smiles: Apparently she never smiles.
  Yang Dae-Su: Ooh, did you just smile? Super awkward.

Lee Su-hyeok

Lee "Bare-su" Su-hyeok

Played by: Park Solomon

Dubbed by: Yoshiki Nakajima (Japanese), Darren Keilan (English), Jose Luis Piedra (Latin American Spanish)

Debut: Episode 1

A former bully who turned straight-laced after leaving his delinquent group. He is a skilled fighter that aspires to join the military.

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• The Ace: Su-hyeok is acknowledged as a great fighter by both the good guys and the bullies. It's especially telling when Su-hyeok is challenging several bullies, and their leader does not fight him but resorts to blackmailing Cheol-Soo and Eun-Ji instead.
• Adaptational Attractiveness: In the webtoon he is average looking with sort of an afro hairstyle, but in the show he is played by Park Solomon who is also a model.
• Adaptational Badass: Su-Hyeok is just a regular kid in the manhwa with no spectacular abilities, but here he is athletic and learned how to fight well due to hanging out with a gang of bullies in the past. Even the Big Bad has second thoughts at first before engaging him in a fight.
• Adaptation Relationship Overhaul: He is not a former bully in the webtoon and doesn't know Gwi-nam at all.
• Affectionate Nickname: He always referred to Nam-ra as "Prez", but not because he wanted to taunt her like the rest of their classmates. When he calls her by her name for the first time, Nam-ra points it out. Later he confesses to Nam-ra that he always called her "Prez" because he didn't want her to know he has a crush on her.
• Always Save the Girl: To Nam-ra, even before he confesses his crush to her.
• Armor-Piercing Question: Cheong-san has a private conversation with Su-hyeok where he insists that they should be wary of Nam-ra, now that she is bitten. Su-hyeok asks him if On-jo were in a similar situation, would he be able to dump her? Cheong-san gives no answer back.
• Badass in Distress: Just like Cheong-san, Su-hyeok gets himself into situations where he stays behind making On-jo, and later Nam-ra, worry about his well-being. In the second episode he stays behind to fight the zombies, causing On-jo to almost break down due to not knowing his whereabouts.
• Badass Normal: Due to his fighting abilities, he's one of the most capable at handling the zombies. When fighting the super-humanly strong Gwi-nam, Su-hyeok gets the upper hand several times and would most likely have won if not for Gwi-nam's regeneration.
• Battle Couple: When its not Cheong-san, his fighting partner is usually Nam-ra.
• Bare-Fisted Monk: He fights the zombies with nothing but his fists.
• Bash Brothers: Whenever it comes to do something dangerous, Su-hyeok will always accompany Cheong-san, or the other way around.
• Big Man on Campus: Su-hyeok is shown, despite being a former bully, to have a large group of friends. He is tall, handsome, athletic and has two girls crushing on him. The only thing he is not is a straight A student.
• Book Dumb: Is shown to be someone who doesn't pay attention in class.
• Brick Joke: In the first episode, Dae-su explains to Ms. Park that Su-hyeok is referred as "Bare-su" because he never wears socks and it smells bad. Several episodes later, Su-hyeok sleeps without his shoes on and its shown that he doesn't wear any socks.
• Brooding Boy, Gentle Girl: Gender inverted, but otherwise the golden couple for this dynamic. Lee Su-Hyeok is popular, sociable and courteous, while Nam-ra is introverted, quiet and aloof.
• Bros Before Hoes: Whereas Cheong-san doesn't fight with him over On-jo, Su-hyeok attacked him over Nam-ra, because he was in love with her. Cheong-san wanted to kill Nam-ra after she got bitten.
• Cannot Kill Their Loved Ones: When Nam-ra almost attacks On-jo, Su-hyeok holds a shovel above her, but cannot bring himself to hurt her.
• The Charmer: He is quite the smooth-talker and easily befriends other people.
• Chick Magnet: On-jo and Nam-ra both have a crush on him. There is a deleted scene where Mi-jin would have confessed her romantic feelings for him.
• Dumb Jock: I-sak mentions that Su-hyeok is very athletic, but he is usually Book Dumb. Downplayed, he is clearly street smart and a competent leader for his group.
• Eating the Eye Candy: Su-hyeok does stare longingly at Nam-ra in a flashback about Byeong-Chan's creepy behaviour, and one of the reasons he likes her so much is that he finds her to be physically attractive.
• Embarrassing Nickname: "Bare-su", because he refuses to wear socks with his shoes.
• First Love: According to Park Solomon, Nam-ra is the first girl Lee Su-hyeok ever loved.
• The Gadfly: He teases Cheong-san a lot just to get a reaction out him about On-jo. He asked Cheong-san's advice about dating On-jo, just to make the latter jealous. In their first scene together, he makes Nam-ra giggle by joking about how talkative she is.
• Gang of Bullies: Played with. It is known that Su-hyeok used to hang out with the bullies in the 10th grade, but he appears in none of the flashbacks with the bullies. For someone who is a Reformed Bully, Su-hyeok is well liked, with nobody resenting him for his past.
• Genre Savvy: Second character after Cheong-san to call the rabid students for what they are, zombies.
• Heartbroken Badass: Losing Nam-ra because she is infected affects him on an emotional level.
• Insecure Love Interest: Su-hyeok implies that he didn't tell Nam-ra about his feelings earlier, because he always felt unworthy of her. He is a former bully, while she was the upper class girl with a pristine reputation.
• The Leader: While the leading position can change depending on the situation or who is making the escaping plans, Lee Su-hyeok is generally the one leading everyone. He always looks out for everyone and makes sure they all are making to safety before himself.
• The Lancer: He always has something to say about Cheong-san, but they are very good friends and Cheong-san can rely on his muscles any time he needs.
• Lovable Jock: Athletic and well-liked among his classmates.
• Love Triangle: On-jo is attracted to him, and he is attracted to Nam-ra.
• Made of Iron: Su-hyeok gets some heavy hits all the time. He is slammed to the ground, kicked in the guts by Gwi-nam and shows no sign of broken ribs after, not even bruises.
• Nice Guy: He is very courteous to the girls and ready to stand up for those in need.
• One-Man Army: He can fight hordes of zombies all by himself without being bitten.
• Opposites Attract: In Su-hyeok's own words, "I don't get good grades, and I hung out with the bullies in the tenth grade. But you're a model student and get good grades".
• Promoted to Love Interest: On-jo and Nam-ra are not attracted to him the webtoon.
• Romantic False Lead: He has several genuine moments of Ship Tease with On-jo, like holding hands, hugging and consoling her, and seems to be interested in her to some degree (enough to keep her name tag for an extended period). He ends having a relationship with Nam-ra.
• Shipper on Deck: Given how much fun he has while troubling Cheong-san about his secret feelings for On-jo, is suffice to say he wants to see them together. Later he advises Cheong-san to treat On-Jo like the girl she is, not like a guy if he really wants her attention.
• Reformed Bully: He's a former bully, as seen in his Establishing Character Moment in the first episode. This also makes him one of the few students who can hold off a zombie on their own.
• Tall, Dark, and Handsome: He is the tallest teen, and has at least two girls crushing on him.
• Tall, Dark, and Snarky: He is also very witty and charming.
• You Called Me "X"; It Must Be Serious: He calls Nam-ra by her name for the first time just when she was about to bite him. Nam-ra notices this and asks him later why he suddenly called her by her name instead of just "Prez".
• Zombie Advocate: He is the first to defend Nam-ra after getting bit. He fights Cheong-san, who wanted to get rid of her, and swore he would be the one to throw her out of the window at the first sign of trouble.

Han Gyeong-su

Han Gyeong-su

Played by: Ham Sung-min

Dubbed by: Joshua Kwak (English)

Debut: Episode 1

Cheong-san's best friend. Han Gyeong-su was raised by his grandmother his whole life.

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• Adaptation Relationship Overhaul: In the webtoon Gyeong-su is the one to slap Na-yeon for her bad behavior instead of Nam-ra.
• Belligerent Sexual Tension: Invoked by his friends, believing that he and Lee Na-yeon may actually like each other but are just too stubborn to acknowledge. Sadly subverted, Lee Na-yeon's bad attitude towards him was genuinely hateful.
• Dies Differently in Adaptation: Downplayed. Na-yeon uses a band-aid to infect Gyeong-su instead of a handkerchief.
• Deadly Scratch: Zig-zagged. Although originally fine after being scratched by a zombie, the trope is played straight when Na-yeon rubs his scratch with zombie blood, deliberately infecting him.
• Hormone-Addled Teenager: Not even a Zombie Apocalypse can stop him from peeping under Lee Na-yeon's skirt while she was descending the makeshift ladder from the hose. It earns him a Dope Slap from Ms. Park.
• Keet: He is jovial, and gets excited about everything with a big smile on his face.
• Kill the Cutie: Double-subverted. After being scratched by a zombie, Na-yeon assumes he was infected, and insists he stays in the recording studio. He turns out to be fine, only for Na-yeon to deliberately infect him with zombie blood.
• Nice Guy: He's usually cheerful, only getting into verbal spats with Na-yeon due to her constant provocations and unhelpful nature. Before the outbreak, he was originally friendly and playful even towards her.
• Non-Uniform Uniform: He wears a grey hoodie over his regular uniform.
• Raised by Grandparents: Turns out he was raised by his grandmother.
• Starving Student: Implied as he's said to be a "welfie" (a person on welfare). Early on, he offered himself to be a delivery guy for Cheong-san's mother's restaurant, in exchange of a very cheap salary and fried chicken.
• Would Hit a Girl: He tried several times to hit Lee Na-yeon for insulting him.

Yang Dae-su

Yang Dae-su

Played by: Im Jae-hyuk

Dubbed by: Arvin Lee (English)

Debut: Episode 1

A fellow student of Class 2-5 and Wu-jin's best friend. He is the main source of comic relief, but his big size hides the sensible soul of a singer.

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• Acrofatic: Out of all fat characters, he is the only one shown being agile and fast.
• Ascended Extra: It's a given since he survives the events of the first season, while his comic counterpart dies early on.
• Amazon Chaser: Dae-Su is Ha-ri biggest "fangirl". He has a crush on her because he was always impressed by her archery skills and even went to every tournament she had.
• The Big Guy: Is the largest and strongest out all of the students.
• Big Fun: Cracks the most jokes throughout, mostly to try and keep everyone's spirits up in dire times.
• Book Dumb: Has no idea what SOS means.
• Butt-Monkey: He is the butt of almost every embarrassing moment. That includes farting at the wrong time, being shot with the fire extinguisher by On-jo, everyone refusing to hold hands with him on a heartwarming scene on the rooftop and being kicked by his own crush.
• Cloudcuckoolander: He genuinely believed that his biology teacher kept Kim Hyeon-ju as hostage for two days because he was filming a porn movie with her.
• Cuckoosnarker: Among many of his funny lines, Dae-su knows how to dish out a snide remark.
  Hyo-Ryung: There is something called collective intelligent.
  Dae-Su: There are too many unintelligent people here.
• Dope Slap: He is always on the receiving end for saying or doing stupid things at inappropriate moments.
• Establishing Character Moment: Yang Dae-su is introduced wearing his sweater vest on the back of the neck, like in a sauna, making a weird ritual at the window by inhaling the smoke coming from two teachers smoking.
• Fat Best Friend: Of the Cloudcuckoolander variety to Jang Wu-jin.
• Fat Comic Relief: Dae-su is both a Big Eater and a Gasshole, ending up as the punchline to many jokes, as well as being a very prominent Plucky Comic Relief character in the series.
  Jang Wu-Jin: You can't go out there at your size, fatso.
  Dae-su: My size?
• Genre Savvy: He comes up with the term "hambie" (halfbie in English) for those who are infected with the zombie virus but not fully turned into zombies, and compares the outside situation to the Zombieland movie.
• Hidden Depths: Aspires to be a popstar and is quite the talented singer.
• Manly Tears: Downplayed as Dae-Su is quite a sensible person, but otherwise one of the most badass characters. He cries his balls out every time someone close to him dies.
• Nice Guy: He's not only kind and optimistic but he's also brave with his huge body strength that he always uses to protect his friends.
  • Special mention goes to him having enough compassion to apologize to Cheong-san for attacking Cheong-san's zombiefied mother, instead of being angry with Cheong-san for retaliating.
• Non-Uniform Uniform: He wears the P.E. sweatpants instead of the regular plaid pants with the shirt and vest.
• Spared By Adaptation: Dae-su is maybe the third or fourth victim of the outbreak in the webtoon, but survives the first season of the Netflix Adaption.
• Stout Strength: He is strong and athletic and frequently serves as the muscle of the group using the largest pieces of furniture for shields, and is able to support barricades by himself.
• Those Two Guys: He and Wu-Jin are best friends, with Dae-su often calling him "brother-in-law". Dae-su is devastated when Wu-Jin dies.
• Tragic Keepsake: Dae-Su puts the chocolate wrapper from the gym in the food offerings, since he feels guilty for not leaving the last bite of candy for Joon-young, telling the others that he didn't have the heart to toss it.

Lee Na-yeon

Lee Na-yeon

Played by: Lee Yoo-mi

Dubbed by: Ru Kumagi (English)

Debut: Episode 1

A wealthy but snobbish student, whose only job before the outbreak was to spread Malicious Slanders about others.

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• Adaptational Nice Guy: If it can be believed, Lee Na-yeon is far worse in the webtoon. At least in the show she shows genuine remorse for what she has done and tries to bring food for her classmates before being killed by Gwi-nam. In the webtoon, she hallucinates Gyeong-su and stabs Wu-Jin with a scissor. Later, Na-Young kills Mrs. Park too because she sees the vision again. Gwi-Nam still kills her later on, but she dies thinking she was right.
• Adaptational Personality Change: Webtoon Na-Yeon is an elitist girl, but shy with mental health issues on display which just worsen as the ordeal goes on. In the show, she is a Rich Bitch with a Small Name, Big Ego, whose only preoccupation is to gossip about others.
• Adaptation Dye-Job: Has reddish brown hair, while her comic version is a brunette.
• At Least I Admit It: She tries to make the others look like hypocrites, by saying at least she admitted hating Gyeong-su, unlike them who always laughed behind his back.
• Attention Whore: The reason why she gossips so much is her craving for attention.
• Bitch Slap: She is on the receiving ending from Nam-Ra from keeping on denying that she killed Gyeong-Su.
• Dirty Coward: Will cower behind other students while screaming at others to get rid of the present danger. She ends up hiding in the supply closet for the music room (which is full of food and drinks), and never comes out to help her classmates when they also end up in the same room.
• Entitled Bitch: She treats her colleagues bad, badmouths and yells at them, yet still expects them to save her ass. She yells at Nam-ra to do something about the zombies because she is the class president, as if she could do something about it, then blames Nam-ra for the zombie apocalypse.
• Evil Cannot Comprehend Good: Na-yeon is genuinely perplexed seeing the others chose the poor, smelly, but Nice Gyeong-Su, instead of a Rich Bitch like her. She concludes everyone is against her because she is better than them.
• Evil Is Petty: How Gyeong-su dares to touch her or sit on her desk.
• Evil Redhead: Na-yeon has a her hair dyed in a reddish hue and proves to be a shrew.
• The Fashionista: Judging by her pink sweater with multicolored gems, her headband with red appliqués and dyed hair, is clear that Na-Yeon puts a lot of emphasis on the way she looks.
• Gory Discretion Shot: Unlike other victims of Gwi-nam, Na-yeon's getting bitten and her reaction are not shown. We only see a lot of blood running down her legs.
• Hate Sink: Lee Na-yeon barely has any redeeming qualities. She's unhelpful, selfish, cruel, snobby, and looks down on Gyeong-Su (who embodies qualities opposite of hers), constantly and needlessly bullying him. Which culminates in her intentionally infecting him.
• Heel–Face Door-Slam: She's ambushed by Gwi-nam just as she musters up enough strength to bring food to the rest of the group.
• Hope Spot: She was about to redeem herself by gathering enough food to make up with her friends only for Gwi-nam to kill her.
• Inferiority Superiority Complex: Toward Gyeong-Su. She has a sense of superiority because of her healthy status but just cannot conceive that the others are on the "welfie's" side.
• Interrupted Suicide: She gets out of the classroom to be eaten by zombies, but is saved in the last minute by Ms. Park.
• It's All About Me: Even in the face of a full-on apocalypse she thinks her social status and wealth means she'll be given the most importance.
  Han Gyeong-su: Is your own survival all that matters?
• Jerk with a Heart of Jerk: She apparently accepts her mistakes and tries to apologize to Gyeong-Su, except she infects him with the zombie virus only to prove she was right about him.
• Lonely Rich Kid: In her introduction scene, she tries to befriend Nam-ra, the other rich girl of the class, only to be ignored. Na-Yeon has a Girl Posse in Hyo-Ryung and Ji-min, but they are not really her friends. She even says to the others that she is all alone and doesn't need friends who want her to die anyway.
• The Millstone: Lee Na-yeon doesn't do anything helpful except for whining and making things worse for everyone.
• My God, What Have I Done?: After Ms. Park's death, the gravity of her actions begin to dawn on her, haunted by visions of a zombified Gyeong-su. Racked with guilt, she attempts to make it up to the rest of the group by bringing them direly needed food.
• Never My Fault: Her ego is so big that she prefers to infect Gyeong-su so she wouldn't have to apologize for accusing him of being infected. And after Nam-ra exposes her, she claims that Gyeong-su isn't even dead because he survived the fall. Nobody is having it.
• Non-Uniform Uniform: She wears a pink sweater with gem colored buttons instead of her vest.
• The Nose Knows: According to On-Jo and I-sak, Na-yeon knows every smell possible, since she said professor Byeong-Chan smells like rotting corpses. She turns out to be correct about it.
• Pet the Dog: After being filled with guilt over causing the deaths of Gyeong-su and (unintentionally) their English teacher, she fills a bag with food, water, and soda to deliver to her starving classmates on the rooftop. Unfortunately, Gwi-nam deprives her of this moment and kills her before she can leave the room.
• Pink Means Feminine: Her sweater is pink, has colored gems as buttons, wears fancy headbands and has her hair dyed in a light brown tone, showing off her girly fashion sense and wealthy status.
• Playing the Victim Card: Whenever she gets called out on her behavior, Na-yeon often reacts by asking why are they picking on her.
  Ji-min: Na-yeon killed someone and played the victim and left on her own.
• Psychological Projection: She seemed to believe that everyone must think like her, just because several of her classmates laughed when she badmouthed Gyeong-su for smelling bad in the past.
• Rich Bitch: In her introduction she only tries to befriend Nam-ra, since both of them live in the wealthy neighborhood of Hyosan, but is classist to the rest of her classmates, especially Gyeong-su. She constantly calls Gyeong-su a "Welfie" because of his status as a welfare student, and can't comprehend why her classmates would stick up for him.
• Shadow Archetype: To Nam-Ra, both were Lonely Rich Kids, but Na-yeon is what Nam-ra would have been if she would resent people for being poor and badmouth and look down on everyone to make up for her own loneliness. No wonder is Nam-Ra the one who confronts her about killing Gyeong-su.
• Tantrum Throwing: Under the stress of facing a Zombie Apocalypse, Na-yeon thowns her handband on the ground, kicks a chair and yells desperately.
• Tears of Remorse: She breaks into tears after getting caught for killing Gyeong-su, and gets out of the classroom to be eaten by zombies.
• Token Evil Teammate: Na-yeon is cowardly, selfish and not exactly to be trusted. She's even willing to murder someone just to be right.
• The Unapologetic: Na-yeon will never apologize for her discriminatory behavior, Zombie Apocalypse be damned.
• What You Are in the Dark: After being put through the wringer (mostly karmic due to her actions), she is left alone in the room crying and resolves to try and make amends for her actions.

Oh Joon-Young

Oh Joon-Young

Played by: Ahn Seung-Kyun

Debut: Episode 1

The second best student after Nam-ra.

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• Always Second Best: He felt frustration because no matter how hard he studied, Nam-ra always was at the top of the class, to the point he once wished Nam-ra wasn't in the picture. He moved on from those feelings after surviving the zombie apocalypse with her and the others.
• "Could Have Avoided This!" Plot: Joon-Young realizes that if he had awake Kim Hyeon-ju in time like she asked him to, she wouldn't have been turn into a zombie.
• Dropped Glasses: When Gwi-nam confronts the group, Joon-yeong's glasses are knocked off and smashed in the ensuring struggle. His vision ultimately seems okay in spite of it, however.
• Gadgeteer Genius: He is the only one who knows how to pilot a high-tech drone.
• Just Friends: When everyone is getting sincere on their romantic interests (Cheong-san admits that he likes On-Jo, Nam-ra and Su-hyeok become a couple, and Dae-su loudly declares his crush on Wu-Jin's sister), Joon-young puts his hand on Hyo-Ryung's knee... only for Hyo-Ryung to take it off with annoyance.
• The Smart Guy: He is the one who thinks about using a drone in the science lab to survey the current situation and check if Cheong-san is still alive.
• Smart People Wear Glasses: He is the only character who uses glasses in the group. After his glasses get knocked off, he still can see fine.
• You Just Had to Say It: He declares that he would take responsibility if the strategy of building a high barricade fails, over Mi-Jin's idea of building a rooftop for their barricade, so they would have to crawl. After he gets bitten while protecting Mi-Jin, he kicks himself and decides to use himself as bait while the others scape.

Jang Wu-Jin

Jang Wu-Jin

Played by: Son Sang-Yeon

Dubbed by: K. Kevin Choi (English)

Debut: Episode 1

Dae-su's best friend and Ha-Ri's younger brother.

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• Affectionate Nickname: Much to his annoyance, Dae-su jokingly calls him "brother-in-law".
• Big Little Brother: Wu-Jin is younger than Ha-Ri, but towers over her.
• Big Brother Instinct: Inverted with Ha-Ri. Wu-Jin can become protective of his older sister and even his last action before dying is to save her from a group of zombies that were running to attack her and encourage her not to give up her dreams.
• Composite Character: Downplayed since Min-Jae is still present as a character, but Wu-Jin combines traits of both characters from the original. He gets Wu-Jin's given name and role as part of Class 2-5 (as opposed to the archery team group), but Min-Jae's relationship to Ha-Ri. His personality isn't quite taken from either, but is far closer to Min-Jae's than Wu-Jin's.
• Dies Differently in Adaptation: In the web comic he is stabbed by Na-yeon when she hallucinates Gyeong-su in the series he dies protecting Ha-ri.
• My Sister Is Off-Limits: Dae-su often tells him and others that he has a crush on his sister. Wu-Jin is clearly bothered every time he is called "brother-in-law".
• Related in the Adaptation: To Ha-ri. In the webtoon, her brother is Min-jae.
• That Liar Lies: Before he dies, he tells his sister that he immediately knew Ha-Ri didn't make it to the National Team, since she returned to the school right after the tournament. He still knows why she lied and encourages her to not give up on archery.
• Satellite Character: His defining character trait is that he's the brother of Ha-ri, one of the central characters of the bathroom group, and the closest friend of Dae-su, The Big Guy of his class. Other than that there's not much that makes him stand out.
• The Unfavorite: He tells the group that his parents often ignored him in favor of his athlete-prodigy sister, with the hopes that she could qualify to a scholarship in Seoul University through her archery skills. He doesn't resent her in the least and still loves her.
• Those Two Guys: He and Dae-su are best friends, and as stated above, Dae-su often calling him "brother-in-law". Dae-su is devastated when Wu-Jin dies.

Seo Hyo-Ryung

Seo Hyo-Ryung

Played by: Kim Bo-Yoon

Dubbed by: Lisa Yamada (English)

Debut: Episode 1

One of the girls of the group and best friends with Ji-Min.

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• Belligerent Sexual Tension: Played With, as she and Dae-su are seen bickering with Hyo-Ryung seeming the most annoyed with him, but Cheong-san basically says to just date since they are both annoying, with both reacting shocked and offending and then glancing at each other.
• Cute Clumsy Girl: Hyo-Ryung is a sweet individual over all and has a tendency to stumble and fall to the ground. Deconstructed when she falls to the ground at the most inopportune moment, leading to her being attacked by zombies. Good thing Wu-Jin saved her at the right moment.
• Flat Character: Unlike many other characters, main, secondary or minor, she has no quirks, character flaw or something interesting going about her. Kim Ji-Min at least has a mini arc involving her parents that turn her into a Misanthrope Supreme.
• The Load: Along with Na-Yeon, she is also a Neutral Female when it comes to fighting off the zombies, but unlike Na-Yeon, Hyo-Ryung is willing to assist the others with reinforcing the barriers and she eventually starts partaking in the fights against the zombies and manages to pull her own weight.
• Non-Uniform Uniform: She wears the pink tennis team vest instead of the green one, and has sweatpants under her skirt.
• Just Friends: When everyone is getting sincere on their romantic interests (Cheong-san admits that he likes On-Jo, Nam-ra and Su-hyeok become a couple, and Dae-su loudly declares his crush on Wu-Jin's sister), Joon-young puts his hand on her knee... only for Hyo-Ryung to take it off with annoyance.
• Out of Focus: She has the least focus from the main group.
• Pink Means Feminine: She wears a pink tennis vest with her uniform, in the introduction she is seen with a pink curler on her bangs, and her main role is to provide emotional support to her female classmates.
• Those Two Girls: She and Ji-Min are often seen together and casually hugging each other.
• Tomboy and Girly Girl: Hyo-Ryung is more feminine than her friend, Ji-min. She dons a girly bob haircut, wears a pink tennis vest and is generally meek.
• Spared By Adaptation: In the webtoon, she was a female classmate Su-hyeok tried to save as she was escaping from her zombified teacher by climbing out of the window to the next classroom, just as he was helping her into the next room, the zombie ran arround from the classroom to the next classroom, and tackled her from the window to her death.

Kim Ji-Min

Kim Ji-Min

Played by: Kim Jin-Young

Debut: Episode 1

One of the girls of the group and best friends with Hyo-Ryung.

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• Bait the Dog: The army was already about to rescue On-jo's group but due to the sudden news that people can be asymptomatic, they refuse to rescue any of them. Ji-min gets the worst of it being within arms-reach of the helicopter before slowly being lowered back down.
• Broken Bird: Similar to On-jo, Ji-min also loses people dear to her and her faith in humanity, which leaves her bitter and suicidal.
• Bully Hunter: Ji-Min often called out Na-yeon for her poor treatment of Gyeong-su, especially after Na-yeon gets him infected.
• Cynicism Catalyst: She is the only one who tells the group to not feel bad about Na-yeon and Mrs. Park, since they left the safe room on their own. Her bitter demeanor gets worse after she learns that her parents died outside the school grounds.
• Dies Differently in Adaptation: In the webtoon, Ji-min commits suicide, but in the show she was attacked by zombies in the process of escaping to the back mountain.
• Does Not Like Spam: Ji-min hates eating soondae.
• Dramatic Irony: Ji-Min's mom gives her a giant thermos of soondae to share with her friends, and worries because her daughter didn't even eat breakfast. Ji-Min doesn't really like her mom's food. After her parents die, Ji-Min tells Hyo-Ryung that she misses her mom's food.
• Driven to Suicide: She has a big breakdown when she sees that both her parents turned into zombies while they tried to reach her.
• Forgotten Fallen Friend: Despite Ji-Min's build-up into an important character and own conflicts with several characters, she dies in the woods... and nobody ever mentions her or mourns her. Everybody behaves as if she never existed, even Hyo-Ryung, her supposed Best Friend.
• Heroic BSoD: After witnessing her own parents being zombies, Ji-Min cries, and after a suicide attempts, she isolates herself from the others.
• I Want My Mommy!: In her final scene, a scared Ji-min calls for her mom in the woods.
• Jerkass Has a Point: She scolds her classmates for thinking is their fault or hers for what Na-yeon has done, since none of them ever forced Na-yeon to kill Gyeong-Su or Ms. Park to go out after her. Later scenes shows that she was right.
• Laser-Guided Karma: When Hyo-Ryung trips and is about to get swarmed by zombies, she leaves her and gets lost in the woods, later overrun by the zombies and dying. Hyo-Ryung, on the other hand, got rescued in time by the guys, meaning that both of them could have survived if Ji-Min didn't leave her.
• No Sympathy: She feels no compassion for Na-yeon's mental breakdown and thinks the latter has no right to be alive for murdering someone innocent.
  Ji-Min: She is a murderer. She killed Gyeong-su and walked out on her own. Is it right for her to be alive? Aren't you all being pretentious?
• Non-Uniform Uniform: She wears pants instead of the uniform plaid skirt with a shirt and vest.
• Those Two Girls: She and Hyo-Ryung are often seen together and casually hugging each other.
• Tomboy and Girly Girl: Ji-min is more tomboyish than her friend, Hyo-Ryung. Ji-min dons her hair in a Tomboyish Ponytail, wears pants and a green vest, and has a rather confrontational personality.
• Took a Level in Jerkass: Ji-Min starts as a friendly and respectful girl, but after witnessing multiple losses, she finally feels the weight of a zombie outbreak. She loses all the hope and becomes bitter and caustic, scolds her own friends, and always gives them a sharp answer or tells them to shut up if they have nothing good to add.

Yoon I-Sak

Yoon I-Sak

Played by: Kim Ju-A

Debut: Episode 1

On-Jo's best friend.

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• Heterosexual Life-Partners: With On-jo, who was I-sak's best friend.
• Non-Uniform Uniform: She wears the P.E. sweatpants under the skirt with the shirt and vest.
• Prim and Proper Bun: She wears a bun and is quite girly.
• Satellite Character: Most of her characterization comes from being On-jo's best friend and classmate.
• Shipper on Deck: She sustains whomever she believes On-jo likes and she is visibly excited to become the Cupid. If is Cheong-san, she asks if On-jo had sex with him, if is Su-hyeok, she pushes On-jo to ask Cheong-san about how Su-hyeok feels about On-jo.
• Tomboy and Girly Girl: While she is less tomboyish than On-Jo, she wears her gym sweatpants under her skirt and is seen with a lot of teddy bear merchandise, while On-Jo has only her skirt. In one of On-Jo's flashbacks with her, I-sak is the one who chooses make up for her.
• Zombie Infectee: She never admits being bitten in the leg, even after On-Jo takes notice on her symptoms.

Park Hee-Su

Park Hee-Su

Played by: Lee Chae-Eun

Debut: Episode 1

A quiet student who is secretly pregnant.

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• Ambiguous Situation: How Park Hee-Su ended up pregnant and nobody ever noticed. Her entire character is a mystery.
• Developing Doomed Characters: She has her own arc, giving the impression she is going to become an important character later on. Park Hee-Su dies without anyone ever finding out something important about her, unlike the rest of the characters.
• Imperiled in Pregnancy: Hee-Su was already in labor when the zombie outbreak was taking place and dies no long after giving birth.
• Mama Bear: Despite contemplating the option to abandon her newborn baby, she returns to rescue and protect them after hearing of the outbreak. After becoming infected, she uses the remaining time she has left to restrain herself to prevent any harm coming to the child.
• Non-Uniform Uniform: She wears a black baggy hoodie over her uniform to hide her pregnancy.
• Parental Abandonment: Narrowly averted. She was about to leave her newborn baby in the bathroom stall for someone to find, but once she learns that a zombie outbreak is starting, she returns to her baby and tries to keep it safe.
• The Quiet One: She rarely speaks.
• Red Herring: At first it looks like she is also sick when she leaves the school grounds without anyone noticing, showing profuse sweating and pain while walking. It turns out that she was actually skipping school to give birth without anyone knowing.
• Teen Pregnancy: In episode 2, it's revealed that she was pregnant when she gives birth inside a bathroom stall outside the school grounds.
• Tragic Keepsake: She leaves a bear keyring chain for her baby.
• Zombie Infectee: After she gets bitten in the arm, she hurries to find a safe spot to keep her baby safe, while she ties herself up to stop herself from harming the baby. It's only by pure luck that her baby survives, being found by the police detective in Cheong-san's restaurant.

Kim Hyeon-ju

Kim Hyeon-ju

Played by: Jung Yi-seo

Dubbed by: Ashley Park (English)

Debut: Episode 1

One of the school bullies.

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• Asleep in Class: She makes her proper appearance by sleeping in the science lab, while the others were on cleaning duty, then complaining that nobody bothered to awake her for the courses.
• Flat Character: Except for being part of a bully gang, she gets no characterization, not even to become a Mauve Shirt.
• Gang of Bullies: Was part of one, and she was present the day Jin-Su was almost killed by the bullies gang.
• Harbinger of Impending Doom: She comes back to her class, saying she was kidnapped and that the biology teacher did something weird to her. She looks bruised, but in reality she is infected with the Jonas virus.
• Karmic Death: She is part of gang of bullies who tormented Jin-Su, than she dies and gets reanimated by the Jonas virus, created by Jin-su's own father.
• Unwitting Test Subject: Once Byeong-chan realizes she's been bitten by the zombie hamster, he abducts her and conducts a series of tests in a futile attempt to slow down the infection.
• Zombie Infectee: She becomes the first infectee from the Jonas virus in the school grounds. As soon as Byeong-chan learns that she was bitten by the hamster, he kidnaps her and keeps her drugged until he can find a way to slow her symptoms. And taking her to the hospital is what spreads the virus outside the school grounds.
• Adaptational Villainy: in the webtoon she was not a bully and was looking for a place to smoke when she got bitten, though she was implied to be rebelious.

Kim Min-ji

Kim Min-ji

Played by: Kim Jung-yeon

Debut: Episode 1

A student in class 2-5 and close friend of Dae-Su.

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• Boyish Short Hair: She has short brown hair.
• Zombie Infectee: She is bitten by the mouth by Kang Jin-gu, turning her into zombie.
• We Hardly Knew Ye: Dies in the second episode and leaves no impact on the story.

Archery Team and Bathroom Students

Jang Ha-ri

Jang Ha-ri

Played by: Ha Seung-ri

Debut: Episode 2

A senior and a member of the archery team who's first seen being berated by her coach for failing to make it to the regional qualifiers of an archery competition. She is also Wu-jin's elder sister.

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• Academic Athlete: She is part of the archer team, and participated in different competitions to enter to the UNI of her dreams.
• Action Girl: She is a crack shot with a bow and arrow.
• Aloof Archer: Ha-ri is the most efficient zombie killer in the student group with her archery skills, and doesn't betray much emotion until her brother dies.
• Awesome, but Impractical: She and Min-jae can shoot down zombies at a distance. It's a major advantage for them but problems arise when they are faced with swarms and limited (and rare) arrows.
• Big Sister Instinct: Ha-ri is very protective of Wu-Jin. Her main goal throughout the series is to reunite with her younger brother and she was even willing to return to the school full of zombies and risk her safety in order to save him. The only time she breaks down crying is when Wu-Jin dies and she is unable to hurt him when he turns into a zombie.
• The Comically Serious: When paired with someone hammy like Mi-jin, she cannot only express annoyance at Mi-jin's exuberance.
• Cool Big Sis: Wu-Jin admires her and after they meet again after the onset of the virus, Ha-ri's first action is to affectionately pat her younger brother's hand.
• Deadpan Snarker: She is of the rare types who stay deadpan when making a sardonic remark.
  Min-jin: Hey. Why are kids these days so damn rude?
  Ha-ri: No one compares to you.
• Fire-Forged Friends: With Mi-jin.
• Informed Flaw: Ha-ri is said to be a failure in the field of archery. She ends up racking some of the highest kill counts among the Hyosan students.
• I Will Find You: Embarks on a quest to find her younger brother.
• Lady of War: A younger example. She's mature, stoic shooting arrows on zombies with grace and focus.
• The Leader: She leads the bathroom group and moves up as co-leader with Cheong-san once the two groups of Hyosan High survivors merge, and ascends to it after Cheong-san seemingly dies.
• Liar Revealed: She tells her brother that she's made the regional qualifiers. Wu-jin reveals in his dying moments that he knew the entire time that it was a lie.
• Meaningful Name: Jang means archer.
• Not So Above It All: One of funniest moments moments in the show come from her. After Dae-su confessed his love for her, her answer is to kick him.
• Odd Friendship: Has one with Mi-jin, who's in some ways her opposite and has a (later on, playfully) belligerent dynamic with her.
• Only Sane Woman: Of her group, she is the most mature and calculated and has hard times trying to keep the others in check.
• Parental Favoritism: Jang Wu-Jin tells his friends that his parents often ignored him in favor of his athlete-prodigy sister, with the hopes that she could qualify to a scholarship in Seoul University thought her archery skills.
• Related in the Adaptation: In the comics, Jung Min-jae was her sibling. The show changes to Woo-jin being Ha-ri's younger brother.
• The Stoic: She is not the most talkative person around.
• Tomboy and Girly Girl: While both are Action Girls, Ha-ri and Mi-jin are very different from each other. Ha-ri has long hair, is a stoic Aloof Archer with the poised grace of a Lady of War. Mi-jin is The Lad-ette, has a messy shorthair, constantly swears and is skilled at spear fighting.

Park Mi-jin

Park Mi-jin

Played by: Lee Eun-saem

Debut: Episode 2

A senior student holed up in a bathroom with Joon-sung and Ha-lim.

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• Abled in the Adaptation: Mi-Jin wears glasses in the webtoon.
• Action Girl: She's handy with a makeshift spear and is one of the best in a fight of the heroes.
• Adaptation Dye-Job: Has brown hair in the manhwa, while show Mi-jin has black hair.
• Adaptational Modesty: In the manhwa, Mi-jin wears only a white undershirt and her skirt with a bit of Panty Shots. Here, she wears her full school uniform, but with trousers instead of a skirt.
• Ambiguously Bi: Is hard to tell if she is just bluffing given her personality, but cracks several jokes about being attracted to Ha-ri.
  Mi-jin: Damn. That bitch is so my type.
  • She also impulsively asks out Joon-sung and is annoyed when he rejects her.
  • A deleted scene shows that she developed a serious crush on Su-hyeok.
• Aw, Look! They Really Do Love Each Other: She may be foul-mouthed and rude to everyone, but she genuinely cares for her schoolmates and defends them when they are in danger and they, in turn, protect her too.
• Berserk Button: Absolutely hates when the juniors disrespects her senior status, not that anyone cares.
• Beware the Silly Ones: She is not the brightest person around, but in her Establishing Character Moment, she spears Ha-lim through the head once she started to turn.
• Big Sister Instinct: Despite shamelessly flaunting being a senor in their faces, she is oddly protective of her younger classmates and goes to great lengths to keep them safe.
• Book Dumb: So Book Dumb that she is not even sure if she is ever going to get admitted to college, her grades are bad enough to repeat the year.
• Deadpan Snarker: Seems to be the only way she can communicates with others.
• Fire-Forged Friends: With Ha-ri, after being initially dismissive of her.
• Genre Savvy:
  • Upon hearing Ha-lim's condition, she gets Joon-sung out of their stall and fashions a spear to kill the former once they turn.
  • She is aware than in zombie movies, those who get to the supermarket, have higher chances of survival.
• Gotta Pass the Class: Her grades are horrible.
• Hair-Trigger Temper: Anything can trigger Mi-jin's temper, she even had a physical fight with Ha-ri over nothing.
• Hero-Worshipper: After warming up to Ha-ri, Mi-jin often comments how cool she is.
• Jerk with a Heart of Gold: Her personality may be fairly abrasive, but she means well.
• The Lad-ette: Mi-jin survives the Zombie Apocalypse by cursing, smoking and complaining about her bad grades.
• Masculine Girl, Feminine Boy: Mi-jin is a hot-tempered Action Girl, while Joon-sung is a meek Lovable Coward.
• Must Have Nicotine: Mi-jin is first seen smoking a cigarette in a stall separate from the other two. At times, she's also expressed wanting one.
• No One Gets Left Behind: She's doggedly determined not to let the injured Joon-sung go, but they let themselves go from their stretcher so the rest of the group can escape into the storage room.
• Odd Friendship: Has one with Ha-ri, who's in some ways her opposite and is (later on, playfully) belligerent to her.
• Plucky Comic Relief: She has a clownish demeanor even in the most dire situations.
• Running Gag: She repeatedly brings up the issue of her going to college, often in the most inappropriate times. It culminate with her wearing a signboard declaring that all students who survived should be allowed special admission to college in the refugee camp.
  • To a lesser degree, Jun-sung.
• Sir Swears-a-Lot: She drops the f-bombs so often is not exaggeration to compare her to Geralt of Rivia or Billy Butcher.
  Mi-jin upon meeting Ha-ri: We're not zombies, you bitch.
  Min-jae: Hey, I think they're ok. Zombies don't curse.
• Smoking Is Cool: At the start of the outbreak, she was lighting up her cigarette in the girl’s bathroom.
• Tomboy and Girly Girl: While both are Action Girls, Ha-ri and Mi-jin are very different from each other. Ha-ri has long hair, is a stoic Aloof Archer with the poised grace of a Lady of War. Mi-jin is The Lad-ette, has a messy shorthair, constantly swears and is skilled at spear fighting.
• Verbal Tic: "Shibal!"

Jung Min-jae

Jung Min-jae

Played by: Jin Ho-eun

Debut: Episode 2

A member of the archery team.

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• Adaptational Ugliness: In the manhwa, he is Ha-ri's emo and good looking older brother with bit of well defined abs. Here he is just your average Joe with Mandark's bowl cut.
• A Death in the Limelight: Min-jae spends much of his time in the periphery of Ha-ri, his female counterpart. However, he eventually becomes separated from the group, retreating to the gym, and has a scene of his own where he is killed by Gwi-nam after putting up significant resistance.
• Demoted to Extra: He is just a side character with no importance to the plot because all of his importance goes to Jang Wu-Jin, who becomes Ha-ri's brother in this adaptation instead of him.
• Defiant to the End: Min-jae is bitten by Gwi-nam in a fit of rage. In spite of Gwi-nam's augmented powers, however, Min-Jae continues to resist, stabbing Gwi-nam with an arrow and attempting to shoot him with a bow before finally turning.
• Forgotten Fallen Friend: Much like Ji-Min, is like he never existed, Ha-ri and the others don't mention him at all, after his separation from the group.
• Out of Focus: Remains largely under Ha-ri's shadow until his separation from the main group.
• Unrelated in the Adaptation: He was Ha-ri's older brother in the webtoon.

Yoo Joon-sung

Yoo Jun-sung

Played by: Yang Han-yol

Debut: Episode 2

One of the students holed up in the bathroom along with Mi-jin and Ha-lim.

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• The Big Guy: Of the archery/bathroom group.
• I Will Only Slow You Down: Rendered somewhat immobile as a result of being impaled by a zombie, he breaks free from his stretcher so Mi-jin and the rest of the combined group can escape into the storage room of the auditorium.
• Lovable Coward: Is opposed to navigating throughout the zombie infested school but not enough to leave his friends behind.
• Masculine Girl, Feminine Boy: Mi-jin is a hot-tempered Action Girl, while Joon-sung is a meek Lovable Coward.
• Pull Yourself Down the Spear: Falls on the receiving end of one from a zombie after his stick breaks into two.
• You Can Barely Stand: He's put out of fighting condition once a zombie impaled him with his own weapon.

Lee Ha-lim

Lee Ha-lim

Played by: Hwang Bo-un

Debut: Episode 2

One of the students holed up in the bathroom along with Mi-jin and Joon-sung.

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• Zombie Infectee: Joon-sung doesn't realize she's infected until Mi-jin barges through their stall and shows her bite mark.

Rooftop Group and the bullying victims

Min Eun-ji

Min Eun-ji

Played by: Oh Hye-soo

Debut: Episode 1

A student who's picked on by Gwi-nam and his Gang of Bullies.

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• Blaming the Victim: Eun-ji had previously gone to staff at the school about her bullying. One of them dismisses her by asserting that she must be doing something that warrants the bullying. Predictably, when Eun-ji later encounters this same teacher hiding out, it doesn't end well for him.
• Broken Bird: Hoo boy, possibly the most tragic example. From the moment she was introduced, she was forcefully undressed, filmed, and the photos are threatened to be uploaded onto Internet. Her memories show that even beofre this she was always bullied by her classmates and her teachers did nothing to help her. She is Driven to Suicide.
• Bullied into Depression: Much like Lee Jin-su, she was also bullied for years by her own class-mates, until she was sexually assaulted and Driven to Suicide.
• Determinator: She manages to resist turning longer than anyone by focusing on the task of destroying all the phones in the hopes of smashing the one set to upload nude photos of her to the internet. It later turns out to be a subversion. She wound up infected with a mutation of the virus that lets her keep her sentience.
• Dissonant Serenity: She acts very calm around walkers, smiling at the sight of seeing students, especially those who tormented her, turned into zombies.
• Driven to Suicide: Subverted - the only thing that stops Eun-ji—who has just been told that her bullies are going to leak naked images of her online—from jumping off the roof is the zombie outbreak.
• Elite Zombie: She is one of the few, along with Gwi-nam and Nam-ra, to be infected with a mutation of the virus. She doesn't show symptoms, keeps her sentience, but has Nigh-Invulnerability to major injuries, can still spread the virus through the bite, and still has hunger for human flesh.
• Eyes Always Averted: She always keeps her head bowed, and hides her face under her bangs, never making eye contact with anyone.
• Expository Hairstyle Change: At the beginning of the series, her hair is long and covering most of her face, reflecting her meek personality and the fear she has from her bullies. After she gets infected with the variation of the virus, she ties up her hair in a ponytail and starts wearing lipstick after she gains new strength to take revenge on the people who wronged her.
• Extreme Doormat: She never fights back her bullies. And choses to stay behind with them when Su-Hyeok is trying to help her because she fears they will treat her even worse next time.
• Fingore: After being infected with the virus, she retains her sentience, focused only in breaking all the cellphones to stop her pictures to be leaked. while smashing one of the phones, she also breaks one of her fingers, not reacting to the pain even after washing her hands and seeing the fracture.
• Friendless Background: In her flash-backs, Eun-ji is shown being isolated by her own classmates and bullied by them.
• Freudian Excuse: From Min Eun-ji's point of view, the virus is a retribution for anyone who has ever tormented her.
• Let the Past Burn: Subverted - The school's fire-suppression system foils Eun-ji's attempt to burn the school down.
• Shameful Strip: The bullies forcibly take her clothes off and force Cheol-soo to film her naked.
• Stupid Evil: Attacking Cheol-soo in plain sight was nothing but a foolish move on her part, as it exposed her to the military and got her captured.
• What Happened to the Mouse?: Eun-ji is seen being experimented on to discover an optimal method of luring the zombies to kill-zones. She is not seen after this, and her containment cell is shown empty and in the process of being cleaned.
• Unwitting Instigator of Doom: Thanks to her biting Cheol-soo in revenge, the army discovers that some people may be asymptomatic while carrying the Jonas virus, which instantly leads to any rescue attempt of the civilians to be cancelled. The orders came exactly when the army were saving Class 2-5 survivors.

Kim Cheol-soo

Kim Cheol-soo

Played by: Ahn Ji-ho

Debut: Episode 1

A student who's picked on by Gwi-nam and his Gang of Bullies.

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• Anguished Declaration of Love: He tells Eun-ji he likes her, right when she was about commit suicide.
• Dirty Coward: Cheol-soo refuses to let the other surviving students onto the roof even when there's a rescue helicopter full of armed soldiers present that could take down any zombies that might be chasing them.
• The Ditherer: He does everything he is told by the bullies, keeps his head low and never fights back not even for himself. Is told to film Min Eun-Ji? Sure, he does it without any opposition. In Cheol-soo's defense, the chances of him getting same treatment as Lee Jin-su were quite high if he refused them.
  Cheol-soo: I had not choice. They made me do it.
  Eun-Ji: It's the same as committing a murder because you had no choice.
  Cheol-soo: Still, we'll die if we go.
  Eu-ji: That's so you. You don't have the courage to live or to die. You're a fucking coward, asshole.
• Laser-Guided Karma: He prevents the main group of students from escaping due to his cowardice. He is later biten by Min Eun-Ji in the quarantine camp, the one place where he thought he was safe.
• The Stool Pigeon: A more benevolent version; while he's not seen in the opening scene, he appears to have told the teachers that the bullies are responsible for Jin-su going missing according to Myeong-hwan (one of the bullies).

Lee Jin-su

Lee Jin-su

Played by: Lee Min-goo

Debut: Episode 1

Professor Byeong-chan's son and a frequent victim of the Gang of Bullies.

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• Bullied into Depression: Jin-su has been bullied for an unknown amount of time, which made him depressive and developing suicidal thoughts. Only after his first try of suicide, his father finds out he is being bullied.
• Bully Magnet: It's shown through the flashbacks and the opening sequence that Jin-su was the bullies' favorite target, to the point they once made him enter a washing machine. The constant bullying and his bullies getting away scot-free are the last straws for Byeong-chan creating the virus.
• Driven to Suicide: One of the many times he arrives home after the bullies abused him, Jin-su tells his father that he wants to end his life for the suffering to just go away, which breaks his father's heart and pushes him to create a solution.
• Morality Chain: Byeong-Chan only starts developing the virus after his son gets seriously bullied at school, and it isn’t after his zombification that Byeong-Chan becomes more pessimistic on humanity.
• Patient Zero: He becomes this after his father injects him what he thought would be an enhancement serum to fight off his bullies, but when it became a zombie virus, he ended up biting his mother, forcing Byeong-chan to keep both of them chained in the apartment. In the last episode, the military force finds them and takes them as test subjects to study the virus further.
• The Stool Pigeon: He was the first one who tried to report the bullies by telling his father what happened, but with no avail, since the school staff and the police couldn't do anything against the bullies. But he and the other victims had to keep quiet and take back their statements when the bullies indirectly threaten them.
• Stuffed into a Trashcan: Not a trashcan, but he gets stuffed in a washing machine by Gwi-nam and Myung-hwan.
• Tragic Monster: He was just an innocent kid picked on by bullies. His father tried to help him by giving him a Super Serum to make him stand up to his bullies as a last resort when the system let them down. Sadly instead, he becomes Patient Zero for the zombie virus.
  Byeong-chan: ... That's how desperate I was to save him. Rather than die as a human, I wanted him to survive as a monster.

The Bullies

Yoon Gwi-nam

Yoon Gwi-nam

Played by: Yoo In-soo

Debut: Episode 1

A violent bully whom becomes the main antagonist in the series, after being bitten and turning into a half-zombie.

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• Adaptational Curves: Inverted. Gwi-nam has a strong build and a square jaw, while in the show he is rather Lean and Mean.
• Adaptational Nice Guy: Downplayed: in the comic, Gwi-nam's penis was bitten off after attempting to rape the girl. In the show, he instead strips Eun-ji and takes photos of her. He also kills more survivors in the webtoon, and his main objective was to sexually assault and eat any female survivors. Ha-ri and Mi-jin even find severed ears and nametags in a bag he carried. Meanwhile, in the show, his primary goal is killing Cheong-san.
• Adaptation Relationship Overhaul: In the webtoon, he never knew about the existence of Cheong-san's group, although he still meets them on the rooftop and tries to murder everyone. He never has any personal enmity with Cheong-san, nor he and Su-hyeok ever hang out together as bullies and he never shows any interest in Nam-ra.
• Arch-Enemy: To Cheong-san, after the latter gouges his eye out with a phone.
• Ax-Crazy: After the zombie outbreak, he becomes a homicidal maniac who will kill anyone if they become the least bit inconvenient to him. After he turns into a hybrid, he becomes infinitely worse.
• Blood Knight: Anytime Gwi-nam gets involved in a violent act, he starts smirking like he's having the time of his life. He is introduced beating Jin-su just because he was pissed off, and when he was asked to stop, he becomes even more violent.
• Barbaric Bully: Gwi-nam is big, sadistic and sports Delinquent Hair.
• The Bad Guy Wins: Downplayed. While he didn't stop the survivor group from escaping, his ultimate goal was to kill Cheong-san and gouge his eye out, the latter of which he accomplishes.
• Berserk Button: Telling Gwi-nam that he is nothing more but an underlying to other bullies is a sure way to earn his anger. Even telling him what to do or not obeying him makes him mad as it says he's not superior to them.
• Big Bad: The closest thing to one.
• Bully Brutality: He lands Jin-su in hospital by throwing him off the roof.
• The Dragon: Was this to the head bully before the virus, becomes full on Dragon Ascendant once he transforms.
• Delinquent: Beside being a bully, he also crushed his own father's car.
• Dirty Coward: Often used others as bait in the beginning of the outbreak, even if they tried to help him. He also desperately pleads with Cheong-san to save him from the swarming zombies despite literally trying to kill him moments earlier (as well as throwing another student to the zombies mere moments earlier).
• The Dreaded: Between the zombies and Gwi-nam, the heroes would rather face the zombies than him.
• Evil Counterpart: To no less than three people.
  • To Cheong-san, he considers him to be his Arch-Enemy.
  • Lee Su-hyeok used to hang out with Gwi-nam and the bully gang he was part of. Both are good fighters, but Su-hyeok chose to see the errors of his way at some point and became a Reformed Bully.
  • Both him and Nam-ra are Elite Zombies, and have several clashes.
• Elite Zombie: He is one of the few, along with Eun-Ji and Nam-ra, to be infected with a mutation of the virus. He doesn't show symptoms, keeps his sentience, but has Nigh-Invulnerability to major injuries, can still spread the virus through the bite, and still has hunger for human flesh.
• Establishing Character Moment: Gwi-nam is introduced holding the umbrella for his boss, then beating Jin-su.
• Eye Scream: Loses an eye thanks to a cellphone stabbed into his face, courtesy of Cheong-san.
• Feel No Pain: He can be hit with anything, even thrown out of the school building several times, but he won't react to any sort of injury inflicted onto his body.
• A God Am I: Refers to himself as such after he survives his zombie attack and finds they ignore him after his transformation.
• Gang of Bullies: Was part of one.
• Greater-Scope Villain: It can be argued that he and his bullies are the reason for the outbreak in the first place.
• Hate Sink: Even more so than Lee Na-Yeon, as his cruel actions as one of the worst bullies in Hyosan high school essentially kick starts the apocalypse. Once the outbreak begins, he throws four people to the zombies with no hesitation. It gets worse once he turns.
• Hero Killer: He bits Cheong-san in the hopes of killing him. He also kills Min-jae after biting him and turning him into a zombie.
• Implacable Man: After his transformation, he becomes almost unstoppable, thanks to being partially undead.
• Internet Jerk: He crosses the Moral Event Horizon by forcefully stripping Min Eun-ji and threatening to upload the video onto the Internet and send it to her mother.
• It's Personal: After losing his eye, courtesy of Cheong-san, his makes a life goal of killing Cheong-san. Despite having more personal matters with Su-hyeok or Nam-Ra doing more damage to him than Cheong-san, he really wants to make him suffer, badly.
• Jerkass: He seems to live solely for the purpose of causing other people emotional and physical harm.
• Laser-Guided Karma: He seemingly dies in the airstrikes on the city.
  • He throws Do-min to the zombies and tells Cheong-san to beg for his life while trying to kill him in the library fight. He is thrown to the zombies by Cheong-san and then begs for help.
• Light Is Not Good: He often sports a white shirt or jacket and is the most brutal and merciless towards people.
• Psycho Knife Nut: He carries a kitchen knife with him and slices down zombies, and humans alike.
• Pushed at the Monster: When he escapes to the canteen kitchen, Gwi-nam pushes several students in the way of the zombies to save his own skin. He does the same with Do-min in the library. Karma catches up to him when Cheong-san does the same to him after gouging his eye in the library fight.
• Resurrection Revenge: Against Cheong-san, for taking his eye.
• Running Gag: A Black Comedy variant. Gwi-nam just can't stop falling off tall heights. From bookshelves to staircases up to scaffolding and rooftops.
• Sadist: Enjoys toying with other students before he infects them with the virus.
• Say My Name: "CHEONG-SAAAAN!" Someone believes they are a shonen rival.
• Sir Swears-a-Lot: "Fuck you, you fucking bastard."
• The Sociopath: A low-functioning example. He shows no regard for the lives of others, will gladly screw others over to save himself, and will go to insane lengths to get revenge against anyone who slights him.
• Ungrateful Bastard: When running from the zombies in the kitchen, a cafeteria worker invites him to join her in her hiding spot. He responds by pulling her out and throwing her into the path of the zombies.
• Villainous Rescue: Saves Su-hyeok from a random zombie while looking for Cheong-san.
• Villain Protagonist: He is one of the main characters, with his own narrative.
• We Can Rule Together: After smelling Nam-ra and realizing she is a half-zombie like him, he makes this offer to her. She doesn't even consider it and throws him off the building.
• Would Hit a Girl: Pushes a female student to the zombies and uses a female cafeteria worker as a human shield. Both Lee Na-yeon and Nam-Ra were at the receiving end of his sadism after he became a hambie and On-jo nearly suffered from it too.
• Zombie Infectee: Though he retains his intellect, Gwi-nam gleefully bites and infects multiple people. If not for his assumed death, Gwi-nam could very well have escaped Hyosan to continue spreading the zombie plague.

Son Myung-hwan

Son Myung-hwan

Played by: Oh Hee-joon

Debut: Episode 1

The leader of the school bullies.

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• Dirty Coward: When he meets up with Gwi-nam, he tries to make him reach a car, with the intention of using him as distraction while he flees. Gwi-nam, of course, doesn't buy it, and promptly kills him by breaking his arm and luring the other zombies to him.
• Gang of Bullies: Was the leader of his gang.
• The Leader: He was the head bully before the virus, and later gets betrayed by Gwi-Nam during the outbreak.
• Laser-Guided Karma: He's mauled to death after Gwi-nam get's annoyed with him and tosses him to the hoard.
• The Napoleon: He is the shortest of the gang, and the leader, often ordering the others to do the dirty work for him. He knows better than challenging Su-hyeok, since he is taller and more skilled at fighting.

Chang-hoon

Chang-hoon

Played by: Shin Jae-hwi

Debut: Episode 1

One of the school bullies.

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• Even Evil Has Standards: Considers calling an ambulance to help the nurse.
• Facial Horror: He's mauled by the zombified school nurse in the face, and we get a lovely shot of said wound.
• Gang of Bullies: Was part of one.
• Non-Uniform Uniform: Wears a blue jersey over his regular uniform. He also doesn't wear a vest like most other male students.
• Pet the Dog: Contemplated calling an ambulance to help the nurse after she was infected.

Other students

Jang Do-Min

Jang Do-Min

Played by: Zo Zee-An

Debut: Episode 1

A classmate of Gwi-nam and Min Eun-ji.

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• But I Read a Book About It: He argues with Byeong-Chan about the nature of viruses, because in the books is written that a virus is not an independent organism. Byeong-chan contradicts him and says that a virus survives depends mostly on its will to survive, although most Real Life biologists would rather agree with Do-Min.
• Jerkass: He is seen laughing at Eun-ji when she is being tormented by Gwi-nam during the biology class.
• Four Eyes, Zero Soul: Downplayed because he is just a regular student and not a villain, but he takes joy in seeing Eun-ji suffering and pushes Cheong-san down from the bookshelf to be eaten by zombies, despite Cheong-san assuring him he is not bitten.
• Smart People Wear Glasses: He wear glasses and is shown being knowledgeable about how viruses work. The zombie outbreaks catches him in the library.

Teachers and School staff

Park Sun-Hwa

Park Sun-Hwa

Played by: Lee Sang-Hee

Debut: Episode 1

The English teacher.

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• Cool Teacher: She is shown as a firm but friendly teacher. She knows every trick to know if the students gave her their real cellphones during a test, and after giving warnings to the few surviving students across the school, she takes her time to give kind words to try comforting whoever might be listening.
• Heroic Sacrifice: After Na-Yeon leaves the room after what she did to Gyeong-su, she still goes after her and puts her in the music room.
• Only Sane Employee: Ms. Park is the only teacher who cares about the students' well being above the reputation of the school and calls out the Pricipal on his bullshit.
• Reasonable Authority Figure: She tries to keep the group without fighting, and immediately tells Na-Yeon that she is in the wrong after learning what "welfie" means.
• Stern Teacher: She is friendly, but will berate her students for their laziness and mischief. The class motto is even "Sun-hwa is watching".

Lee Byeong-Chan

Lee Byeong-Chan

Played by: Kim Byung-Chul

Debut: Episode 1

The Biology teacher and creator of the Jonas Virus.

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• Absent-Minded Professor: Deconstructed. Lee Byeong-chan cheeks most of the boxes, like being a genius in his field, having an unkept look, wearing wrinkled clothes, unable to have a normal conversation without getting lost in his thoughts and having a weird behaviour. But instead of coming out as an eccentric Cool Teacher, he is perceived as a creep by most of his students. His creepy behaviour and apathy come from the guilt, desperation and depression that he feels in regard to what happened to his son.
• Ambiguously Christian: Byeong-Chan is in the possession of a Bible.
• Apathetic Teacher: Becomes this after he fails to bring to justice his son's bullies, and doesn't even bother to stop Gwi-nam while he is writing obscene words on Eun-Ji's back in the middle of a lecture. He becomes worse after both his son and his wife get zombified.
• Apocalyptic Log: Lee Byeong-Chan has on his laptop a series of journal-videos, which he recorded to explain the evolution of the Jonas Virus.
• Broken Ace: Lee Byeong-Chan majored in cell biology in USA, then became a researcher at a pharmaceutical company and quit for some reason, and landed on a high school teaching position with a miserable life. Even Detective Song Jae-ik acknowledges he should have been a college teacher with those qualifications.
• Dies Differently in Adaptation: In the webtoon, Byung Chan committed suicide while being investigated instead of sacrificing himself like in the drama.
• Elite Zombie: Is implied to have become one.
• Gone Horribly Right: Lee Byeong-Chan only tried to make a super soldier serum to make his son fight back the bullies, not a zombie virus, which still ended up creating a class of super humans. We can say he failed successfully.
• Hope Spot: In one of his videos, Byeong-Chan relates in a hopeful manner that he discovered white cells fighting back the Jonas Virus. I doesn't stick, because the white cells were absorbed by the Jonas virus and turned into a different virus.
  Byeong-Chan: Hope is the cruelest torture that prevents you from giving up on life.
• Kill the Ones You Love: In one of the last videos of his virus journal, he is seen pouring gasoline to his zombified family. Episode 12 reveals that he wasn't strong enough to do it, since the military found them, and takes them away as Patients Zero for study.
• Mad Scientist: He was considered a genius in the Pharmaceutical business, but the debts and losing his job made him have to work as a high school science teacher. In his spare time, he got the time to create a zombie virus to try to fix his son's bullying.
  Yoon I-Sak: They say he was a genius.
  Nam On-Jo: Lots of geniuses go crazy.
• More than Just a Teacher: As someone who majored in cell biology in USA, Byeong-Chan has the qualifications of being a college professor, and he proves it by inventing a virus from testosterone hormones. Yet, he is stuck for in a trivial high school teacher profession.
• My God, What Have I Done?: Has this reaction when he finally sees the outbreak firsthand.
• Nice Job Breaking It, Hero: He created the zombie virus to make his son stronger to fight off his bullies. He ends up unleashing a zombie outbreak, costing thousands of deaths.
• Papa Wolf: Yes, he created a zombie virus that doomed his whole city, but his motivation was to make his son stronger and protect him from the constant bullying he was facing on regular basis, since authorities failed to bring justice.
• Redemption Equals Death: Byeong-chan eventually realizes the error of his ways and gives the only surviving police detective at the station the location of his laptop, which holds all of his research and the key to stopping the virus after sacrificing himself to save him.
• Sanity Slippage: The videos found on his laptop show him slowly losing his sanity and falling into Despair Event Horizon.
• Seriously Scruffy: He used to take care of himself , but after everything that happened to his son, stops taking care of himself, wearing dirty clothing at school and letting a Beard of Sorrow to grow.
• Straw Nihilist: He becomes more cynical after his son gets continuously bullied and the authorities fail to punish the bullies, leading him to think that the strong individuals will inevitably prey on the weaker, so his solution is to make a drug that will make his son stronger. Even after the zombie outbreak starts because of him, he still believes that the bullying started because of the violence in human nature.
• Thousand-Yard Stare: He has a petrified look all the time, a sign that something is wrong with him from the very beginning.
• Unwitting Instigator of Doom: He really didn't want to create a zombie virus, he just wanted to make his son stronger and capable to stand up his bullies after he tried everything to protect his own son, from asking the Principal to handle the situation to moving his son to another school. Sadly, he did not anticipate that the mutated virus will turn his family into zombies, nor that a random girl will get bitten by his infected hamster thinking how cute and small the animal is.
• Villain Has a Point: Lee Byeong-chan makes an excellent point to Detective Song Jae-ik when he says, "They were all accomplices." If anyone, at any time, had made an effort to really stop Gwi-Nam instead of shrugging it off as "the victim's problem", Byeong-chan would not have made a virus that very much became "the victims' problem".
• What Happened to the Mouse?: After becoming a hybrid in episode 4, he disappears.

Kang Jin-gu

Kang Jin-gu

Played by: Yoon Byung-hee

Debut: Episode 2

A sports teacher from Hyosan High.

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• Adaptational Jerkass: In the webtoon, Coach Kang is one of the most heroic adults and saves Ha-ri, Mi-jin, and Min-jae. In the show, he has none of his positive traits at all.
• Creepy Gym Coach: He is known for treating his students bad, calls I-Sak a "fucking bitch" when she asks him to leave the classroom and amost hit her.
• Jerkass: He berates the main group of students for not respecting authority figures even when they call him out on his infection.
• Zombie Infectee: Denies his infection from the students even when they point out his bite mark. When he turns, he zombifies Min-ji.

The Principal

The Principal

Played by: Um Hyo-sup

Debut: Episode 1

The principal of Hyosan High School.

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• Dean Bitterman: He is such a nasty person that doesn't even care about the wellbeing of his students. He did nothing about Lee Jin-su's bullying case, and scolded Ms. Park for calling the police and the ambulance once Hyeon-ju appeared and said that Byeong-chan abducted her, all just to preserve the good name of the institution he is leading.
• Dirty Coward: While the other teachers and students are dying outside, he keeps hiding in his office under his desk. When Gwi-nam reaches his office, he tries to make him get his car through the zombie infested parking lot. Gwi-nam has none of it and ends up slashing his throat.
• No Name Given: He is one of the few characters who's name isn't revealed.
• Skewed Priorities: His reputation and the status of the High School are more important than the victims of bullying or worse, more important than a Zombie Apocalypse.
• Smug Snake: Forces the other teachers to keep the students under control (despite clearly being in the middle of a zombie outbreak), while he hides under his desk, and is more worried about the information of the school being ground zero reaching the news.

Kim Kyung-mi

Kim Kyung-mi

Played by: Yoon Byung-hee

Debut: Episode 1

She is a nurse from Hyosan High.

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• School Nurse: The young, reasonable and attractive variety.
• Zombie Infectee: Kyung-mi was infected by Hyeon-ju when she was trying to hold her down.
• Too Dumb to Live: While is understandable that it was impossible for her to know that Hyeon-ju is infected with the Jonas Virus, what kind of medical staff doesn't treat themselves of human bite, the most dangerous non-venious bite in the world, capable of killing in a few hours if left untreated? Normally, she should have treated herself of a possible septicemia and go at the hospital with Hyeon-ju.

Jung Yong-Nam

Jung Yong-Nam

Played by: Yoon Kyung-Ho

Debut: Episode 2

One of the school teachers.

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• Asshole Victim: When Eun-Ji tries to report the bullies, he dismisses her, gaslighting her instead. When an infected Eun-Ji finds him hiding in the break room, she doesn't hesitate to feed on him.
• Blaming the Victim: He dismisses Eun-Ji, thinking that she must be doing something to attract the bullies.
• Fat Bastard: He doesn't help anyone, opting to stay put by himself in the break room, on top of being a bad teacher who allows bullies to get away.
• Sadist Teacher: In his Establishing Character Moment, he is shown controlling the school gates to leave students out and get late only by seconds. Later on, Eun-Ji remembers clearly that he and the principal were the main responsibles for letting the bullies get by without facing any consequences for their actions.

People from Hyosan

Cheong-san's mother

Cheong-san's mother

Played by: Lee Ji-Hyun

Debut: Episode 1

Cheong-san's mother and owner of the restaurant Cheong-san Fried Chicken.

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• Accidental Misnaming: She calls I-sak "A-sak", to which she asks when did I-sak change names. Cheong-san tells her jokingly to stop changing his friends' names.
• Amazingly Embarrassing Parents: Cheong-san is ashamed that he shares the name with her restaurant, to the point she even uses his face as the restaurant's logo.
• Good Parents: Aside from making Cheong-san very embarrassed, she is still a very loving mother to her son and friends. What makes her death even more heartbreaking is that she was nothing but doting to Cheong-san, always smiling in front of him.
• Mama Bear: Despite not being equipped or fit to fight zombies, she dashes off to the school to try reach her son. She dies as soon as she reaches the campus.
• My Beloved Smother: Cheong-san is annoyed that she uses both his name and his face to promote the restaurant, to the point her husband jokingly tells her that she is on her way to become an annoying mother-in-law if she keeps doing that.
• Supreme Chef: While both On-Jo and her father agree that her fried chicken is a bit salty, it still is very tasty. Cheong-san even jokes that she would be serving fried chicken to the zombies during the outbreak.

Park Eun-hee

Assemblywoman Park Eun-hee

Played by: Bae Hae-soon

Debut: Episode 3

An assemblywoman representing the city of Hyosan and a member of the National Defense Council.

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• Benevolent Boss: While pragmatic regarding her political career, she cares about her staff and their families, putting as priority for the fire department to get them away safely.
• The Needs of the Many: When Nam So-ju asks for her approval to go and save his daughter, she gives him a peptalk hard to swallow about the ugly reality.
  Eun-hee: You're a firefighter. And I'm a politician. Do you know when it's the hardest for people like us? Right now. Because we have to save most people, not the people most precious to us.
• Pink Means Feminine: She wears a pink suit.
• Taking the Heat:
  • So-ju and Woo-shin beat up guards and appropriate their uniforms in an attempt to re-enter Hyosan and save the students at the school, though only the former successfully escapes. Eun-hee then claims responsibility for the incident, falsely stating that she encouraged them to do so. Woo-shin escapes severe punishment as a result, but he notes that her actions were just as motivated by political pragmatism than they were altruism, as Eun-hee and her staff plan to use the video of her confession in future political campaigns.
  • She also refuses to resign as an assemblywoman for Hyosan, even if signing the resignation letter could be spun as her protesting the plan by the NIS to abandon the city.

Se-Bin

Se-Bin

Played by: Ahn Se-Bin

Debut: Episode 6

Se-Bin is a little girl found by Song Jae-ik.

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• Cover Innocent Eyes and Ears: Jae-ik tells Se-Bin to hold into him and keep her eyes closed as log as they ride the motorcycle to the Hyosan Hiigh School.
• Harmful to Minors: She sees her parents in a zombified state and doesn't even understand why they were chasing her.
• Mouthy Kid: She tells Jeon Ho-cheol that he doesn't have to come with her and Jae-ik if he is too afraid of zombies.
• Puppy Love: When Jae-ik tells her he has a son pf her age in order to confort her, Se-Bin tells him she already has a boyfriend.
• Rescue Introduction: Se-Bin is introduced when Song Jae-ik and Jeon Ho-cheol go to save her from zombies who are chasing her.
• Tagalong Kid: She joins Song Jae-ik and Jeon Ho-cheol's quest of recovering Byeong-chan's laptop.
• Token Mini-Moe: She and Hee-su's baby are the only prepubescent characters in a cast where the majority of characters are either teenagers or adults.
• Kid Amid the Chaos: She is found by Song Jae-ik and Jeon Ho-cheol while being chased by zombies.

Hyosan's Fire Station Rescue team 1

Nam So-ju

Nam So-ju

Played by: Jeon Bae-soo

Debut: Episode 1

On-Jo's father and captain of the Fire Station rescue team 1.

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• Action Dad: He is one of the most skilled characters in the show, and does everything in his power to save On-jo.
• Apologetic Attacker: He apologize in advance for attacking the special units and steal their equipment.
• Hidden Depths: It seems that So-ju participated on the World Firefighters Games that took place in Chungju, the 2018 edition and won a championship belt.
• Heroic Sacrifice: Already bitten, he throws multiple flares on the school's tennis court, calls the zombies to him with his whistle, and locks himself inside the court to contain the zombies chasing the Hyosan High survivors.
• Like Father, Like Son: On-Jo takes after her father's survival skills, having learned from him basic things like making a temporary toilet separated from the main area during an isolated scenario, and having the same taste in food regarding Cheong-san's mother's chicken.
• Majorly Awesome: He was a Master Sergeant in the army before becoming firefighter.
• Offscreen Moment of Awesome: In Episode 4, we see him try to hold off a swarm of zombies using only a fire hose (which eventually gets broken). While he's successful enough to give Woo-shin, Assemblywoman Park, and her staff to escape to the rooftop, it is not shown how he managed to get the zombies to stop climbing the stairs.
• Papa Wolf: After clearing his mission of rescuing Assembly member Park Eun-hee and her staff, he does everything in his power to get to the school and rescue his daughter, even breaking out of the quarantine camp. After getting infected, he sacrifices himself to buy time for his daughter and the other teens. And even after his death, his trail helps the group through the forest.

Kim Woo-shin

Kim Woo-shin

Played by: Woo Ji-hyun

Debut: Episode 3

A paramedic from the Fire Station rescue team 1.

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• Eager Rookie: He is dismissed as a rookie by councilwoman Eun-hee, but So-Ju states that Woo-shin is as capable as him to take charge of the situation. He is willing to tag along with So-Ju to On-Jo's school, but is captured before he can make it out with his captain.
• Sole Survivor: He is devastated when he finds out from On-Jo that her father didn't make it, leaving him as the only survivor from his squad.

Hyosan's Police Station

Detective Song Jae-ik

Song Jae-ik

Played by: Lee Kyu-hyung

Dubbed by: Greg Chun (English)

Debut: Episode 2

A police detective in charge of interrogating Byeong-chan.

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• Adaptational Heroism: In the webtoon, Jae-ik is pretty slimy, allegedly corrupt, and supposedly drove a friend of Byeong-chan to suicide. His main good deed is passing vital information on to his colleague. In the show, Jae-ik goes out of his way to help everyone he can, in spite of having very valid reasons not to.
• By-the-Book Cop: While thankful for Ho-Cheol returning with a school bus to save them, he still scolds him and calls him a traitor for abandoning them on the rooftop, and later tells him that he is going to file a report on him for driving without a bus license.
• Composite Character: The show combines Jae-ik with Detective Lee Jaeyong from the webtoon. The show's incarnation takes the arrest and interrogation of Byeong-chan from the original Jae-ik, and then the subplot of sharing knowledge of the virus and rescuing people in Hyosan from Jaeyong.
• Lead Police Detective: He is one of the few police officers not in uniform, and he becomes important to the plot after he learns from Byeong-chan about the laptop with all the data from the zombie virus, having as first priority deliver this information to the military, and rescue as many civilians in his way as possible.
• Papa Wolf: He is very protective of small children. His first response after finding Hee-su's baby is to hurry Ho-chul to find milk for the baby. And when he rescues a little girl who's mother just got zombified, he tries to comfort the kid, insisting that she keeps her eyes shut during their escape. He tells her that he also has a kid her age.
• Spared by the Adaptation: Jae-ik is infected and dies fairly early in the webtoon, getting too close to a zombie and accidentally swallowing her blood. In the show, he survives the first season.
• What the Hell, Hero?: Despite his good intentions to protect his son, Jae-Ik still scolds Byeong-chan for starting a zombie outbreak.

Jeon Ho-cheol

Jeon Ho-chul

Played by: Park Jae-chul

Debut: Episode 4

An auxiliary police officer.

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• Bumbling Sidekick: He ends up playing the sidekick to the heroic Jae-Ik. However, he proves to be very practical and Genre Savvy, avoiding being The Load to his companion.
• Car Fu: Ho-cheol runs over several zombies with a bus when he returns to rescue Jae-Ik and the hapless streamer.
• Lovable Coward: Ho-cheol combines this with Genre Savvy. He isn't needlessly cruel and his cowardly decisions often have sensible logic behind them. For instance, he wants to escape and then arrange for the children he and the detective have found to be rescued later. They are in a locked restaurant with food and water the zombies can't get into. He also smartly points out that if they die the knowledge that all the research of the man who engineered the virus is on a laptop in the high school dies with them. The one time he seems to do something cowardly, abandoning the detective, it's because he realizes that they're about to be cornered and lose their only means of escape. He comes back with a bus, a much safer way to travel than the scooter they had before..
• Plucky Comic Relief: His role as Jae-Ik's sidekick is the main comedy source of their scenes, since he is mostly screaming in terror while whacking zombies in his way out. Even when they are fleeing from the zombies, the scene plays fast-forward with a comedy background music.
• Rolling Pin of Doom: Jae-Ik gives him a rolling pin to battle the zombies.
• The Smart Guy: He briefly tells Jae-Ik that he attended Seoul University as soon as he graduated high school, but Jae-Ik correctly guesses that he is a dropout and failed the exams to get back a few times. Despite his cowardice, he shows to be very smart and quick on his feet, knowing how to escape from the zombies and which method is the most efficient.

Others

Orangibberish

Orangibberish

Played by: Lee Si-hoon

Debut: Episode 4

A streamer from Seoul who ventures into zombie-infested Hyosan to get the exclusive to his viewers.

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• Big Brother Instinct: Downplayed, but he very quickly takes to keeping Se-Bin and the baby safe, as he not only caresses Se-Bin, he also shields her and the baby when the bus is being shot at.
• Genre Blindness: Sure, he got into Hyosan with emergency food, some body protection and an axe, but when Train to Busan exists in-universe he should have anticipated hyper-aggresive swarms of zombies and avoided dark places where might be hiding undead children.
• The Load: Since he sprains his ankle while climbing the roof, Jae-Ik must figure out the way to rescue him, despite his limited mobility. Lucky for them, Ho-cheol finds a bus for them to escape safely.
• Never Bareheaded: He wears an orange knitted hat during his whole stream, even after he gets rescued.
• Only Known by Their Nickname: His real name is unknown, only referenced by his username.
• Plucky Comic Relief: His role in the intro of Episode 4 is to show to outsiders and the average Internet users how the zombie apocalypse actually looks like, keeping an upbeat personality while chased by zombies. Even while being rescued by Jae-Ik, he keeps being the comedic foil for the professional detective.
• Skewed Priorities: Even in the middle of the zombie apocalypse and being chased by zombies, he takes his time to remind the audience to like the stream and subscribe to his channel.

General Jin Seon-mu

Major General Jin Seon-mu

Played by: Kim Jong-tae

Debut: Episode 5

Heads the Martial Law Command which presides over the quarantine efforts in Hyosan.

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• Cold Equation: He choses to sacrifice the 60000 people of Hyosan who were still in the city to save South Korea.
• Driven to Suicide: Feeling guilty from ordering the bombing of Hyosan, he promptly shoots himself after leaving the command room and making what amounts to a video will.
• I Did What I Had to Do: States in his video will that while he understood Byeong-chan's decision not to kill his family, he had to order the bombing of Hyosan as a soldier.
• It's the Only Way to Be Sure: After being briefed on what would happen if even a single zombie escapes Hyosan, he elects to bomb the city.
• Reasonable Authority Figure:
  • While often a stern figure who enforces quarantine protocols in a fair manner regardless of class (as Eun-hee and her entourage learned the hard way), he's willing to accommodate reasonable requests, such as authorizing the rescue of students in Hyosan (a favor So-ju asked Eun-hee to lobby him for), and sending out a mission to retrieve Byeong-chan's laptop.
  • Despite being in Martial Law, he requests the staff to call Sgt. Jae-Jun's parents to inform them of their son's death and ask them for permission to use his body to research the virus. He knows he is allowed to do so without their consent, but he considers it a gesture of respect for the family who gave their son's life to the military.

Staff Sgt. Lee Jae-Jun

Staff Sgt. Lee Jae-Jun

Played by: Park Ji-Yeol

Debut: Episode 7

A soldier who volunteers to contain the zombie outbreak in Hyosan.

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• And Then John Was a Zombie: He gets infected with the virus during the containment mission in Hyosan, and he is later used as experiment subject by the military.
• Blatant Lies: To try calm his worried mother, Jae-Jun tells her that he is going to play soccer instead of going to a dangerous mission.
• Retirony: He was three days away from being discharged from his obligatory military service, and then he decided to volunteer for a containment mission.
• We Hardly Knew Ye: Episode 7 starts by following his perspective through the city. He gets zombified a few minutes in.

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