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The main character. Hes a young man who was raised by a serial killer as an accomplice, and is now trying to thwart his father at every opportunity.
- Abusive Parents: Goes without saying when one's father is a serial killer. Jin's father is extremely manipulative and controlling as well as physically, emotionally, and mentally abusive. He slapped him in the face with little provocation, constantly keeps him under watch, and forbids him from working out (even just doing pushups) in order to keep him physically weak and passive so that he never tries to rise up against him. As a result, Jin is outright offended when Kyun naively suggests he appreciate his father while he's still around.
- Asexuality: Jin appears to be somewhere on the asexuality spectrum, which confuses him when he gets his first crush since the feeling is foreign to him.
- Bad People Abuse Animals: To show how sociopathic Jin used to be, we see that he once found a spider and ripped it's legs off for fun and even neatly placed the piece on the floor.
- Because You Were Nice to Me: Jin eventually reveals that the only reason he didn't give Kyun to his father at first was she was the only person to smile at him.
- Berserk Button: Jins father is this to him in general. But so is harming Kyun or Manny.
- Break Her Heart to Save Her: Jin shouts at Kyun to screw off when he learns his father is coming to the hospital to see him because he doesn't want her to become his next victim.
- Break the Cutie: Jin is quite possibly the biggest cutie to ever be broken. Nothing in his life goes right, and in his own words, he doesn't have a single good memory.
- Broken Tears: Jin cries to Kyun in episode 31 after an emotionally-charged confrontation with his father.
- Chaste Hero: Unsettlingly deconstructed. Episode 15 reveals that he doesn't know what sex is, how it's done, or what its purpose is, despite being in high school. When he innocently asks Kyun to explain porn to him, she asks him why he didn't learn about it in sex ed (he missed a class), on the Internet (he didn't know it could be viewed online), from his friends (he doesn't have any), and finally, from his parents, which triggers in him a panic attack when he recalls an instance in which he listened in on his father murdering a woman. Despite knowing all about a woman's "inner workings," Jin is completely naive in regards to sexuality, emphasizing how exposed he is to the evils of the world and how sheltered he is from the pleasures.
- Creepy Child: Turns out that before his accident, Jin actually enjoyed helping his father murder people without understanding why it was wrong.
- Crush Blush: Jin gets one at the end of episode 22 when he realizes he really does like Kyun.
- Dark and Troubled Past: Jin's father is a serial killer who forced him to help commit his crimes, so it goes without saying.
- Drop the Hammer: Jin uses a mallet wrapped in cloth to attack his tutor in the prologue. It's kept hidden behind a painting in the bathroom.
- Flashback Nightmare: Jin has these often, of his father throwing him off a building as a child.
- Forced into Evil: From a young age, Jin was forced to help his father commit and cover up his crimes even though he knew it was wrong. Now, on pain of death, he can't stop.
- Friendless Background: Even as a child, Jin didn't seem to have any friends, as most people found him creepy and unapproachable while being charmed by his charismatic father.
- Glass Eye: His left eye is a prosthetic since he lost the use of it when he was young.
- Green-Eyed Monster: While trying to decide whether to give Kyun up to his dad, he nearly does when he sees her talking to another guy, but decides not to when she smiles and waves at him. However, considering his issues, it may have had more to do with him deciding whether she was worth possibly being killed for than with him being jealous, although he clearly was a at least a little bit.
- Heel Realization: As a kid, Jin enjoyed murdering people with his father and never cared how their victims felt. But when his mother threw him off the hospital ceiling, he realized that he must have done something wrong and wanted to be "good". While he lost his memories, he gained a sense of empath and was deeply disturbed by his father's actions from then on.
- Lack of Empathy: As a child, Jin had no care about the people that his father murdered. He seems to have gained one when his mother threw him off a hospital though.
- Loners Are Freaks: What his classmates think of him.
- Lonely Rich Kid: Turns out that Jin is actually very rich but he has never had any friends and his only family is his serial killer father.
- Master Actor: Jin had to become this to bring girls for his dad, he even calls himself one.
- No Social Skills: Jin, not having much social interaction with his peers (due to finding him creepy) has little clue on how to act around other kids his age, and has only a child's understanding on certain topics such as sex, even flat-out asking Kyun what porn was without realizing how it could have been interpreted as a perverse gesture. This works to Dongsoo's advantage of keeping him under control.
- Not So Different: It comes up often that despite Jin's disgust with his father, he isn't as different from Dongsoo as he would like to admit.
- Peek-a-Bangs: He covers his glass eye with his bangs.
- Psychotic Smirk: He pulls one for just a moment in episode 7 when Beau Park is being forced to apologize to him, which surprises and unnerves Manny Kim, who questions if Jin's really afraid of them. This hints at his former psychotic nature.
- The Runaway: In episode 32, Jin tells his father over the phone that he's running away from home.
- Took a Level in Badass: After he utilizes Manny Kim's training to defeat Faye Kim.
- Trapped in Villainy: He is forced to assist in his father's murders or else be killed himself.
- Trauma-Induced Amnesia: His first memory is of lying in a hospital bed with horrific injuries and no idea how he ended up there. Subverted, he later realized he was repressing his memories after his mother threw him off the hospital.
- Troubled, but Cute: He is reasonably attractive, and very troubled.
- Wounded Gazelle Gambit: As a child, Jin was forced to pretend he was lost in order to lure a woman to his father so that he could kill her.
- Yandere: He's a milder romantic and platonic example. Although he hasn't killed anyone, there's little doubt that Jin would to protect Kyun and Manny. Justified, in that he knows there's a serial killer who wants to kill one, and is more than willing to kill the other.
Kyun YoonA new transfer student at Jin's school who saves his life from a bully. She becomes his dad's latest target when he sees her at the hospital.
- Break the Cutie: Amazingly averted. Despite her father dying and leaving her not only with a massive debt and loan sharks, but a grandpa with dementia, she's still able to have a positive outlook. Even after being kidnapped by two serial killers, she remains unbroken.
- Distressed Damsel: Gets kidnapped by not one, but two serial killers.
- Good Is Dumb: Kyun decides to visit Dongsoo after Jin stated that Dongsoo liked her to turn him down. Downplayed because Jin didn't tell her that Dongsoo is a serial killer.
- Identical Stranger: Eerily discussed and averted when Dongsoo mentions that Kyun looks like his late wife; Jin notes to himself that they look absolutely nothing alike.
- Love Interest: To Jin.
- Manic Pixie Dream Girl: Subverted. She does draw Jin out of his shell, but it's not only her who does it; Manny helps too, and it's mostly Jin who decides to make friends. Plus, she has her own problems to deal with, and doesn't exist only to help Jin.
- Morality Pet/ Morality Chain: She is the deciding factor in Jin rebelling against his father, and is also what keeps him from snapping on numerous occasions, like when she convinced him not to kill Faye Kim.
- Nice Girl: She really is.
- New Transfer Student: At Jin's school...where she's immediately targeted by a serial killer.
- Team Mom: Is the responsible one in her group, which consists of herself, Jin, and Manny.
- Tsundere: Is usually very sweet, but does berate Jin during some of his weirder times, ranging from his lack of social skills to his creepy moments.
- She's All Grown Up: The epilogue shows her after a time skip.
- So Beautiful, It's a Curse: Kyun is repeatedly stated to be rather cute but this has only made her the target of two serial killers.
- Starving Artist: Played With. Kyun wants to be an artist in the future but her current poverty isn't due to her passion.
The main antagonist of the story, Dongsoo Seon is Jin's father, and is the well-known CEO of a giant corporation. He's also a serial serial killer who's successfully portrayed himself as a kindly and upstanding citizen for years.
- Batman Gambit: Dongsoo is adept at understanding and manipulating people's darker impulses. He was able to get the upper hand during his confrontation with Manny and Mandeuk by playing with Manny's hatred.
- Even Evil Has Loved Ones: He's an absolutely evil person with no remorse for what he does, but he's revealed to genuinely love his wife and son, even if he has a very twisted and cruel love for them.
- Evil Parents Want Good Kids: Averted. Dongsoo actually wanted Jin to be just like him and considered his murders, father-son bonding.
- Has a Type: Jin realizes that Dongsoo has a tendency to murder women like his wife. Non-dyed hair, round eyes and simple clothes.
- Hidden Depths: Despite being a serial murderer who has emotionally and physically abused his son for his entire life, it's revealed that he in fact tried to save Jin from being murdered by his mother when he was a toddler. He also couldn't bring himself to kill Jin's mother after this incident, and states that he doesn't know why he can't bring himself to kill his family.
- I Love the Dead: Disturbingly implied as being one of the factors that govern his choice of victims.
- Karma Houdini: Arguably. He may be Driven to Suicide by the very end of the story, but he's eerily tranquil about it, and he's able to evade being imprisoned for his crimes.
- Master Actor: This goes without saying, as he's able to fool nearly everyone into thinking he's a mild-mannered businessman and philanthropist and escape police notice for years.
- Papa Wolf: Turns out he's this in the most twisted way possible. He attacked Manny because he thought Manny was bullying Jin. And he was enraged when Manny threatened to cripple Jin as revenge.
- Psychotic Smirk: An absolutely terrifying one, made even scarier when comparing the sweet smiles he gives to strangers, and the look Jin is well-acquainted with.
- Strong, but Unskilled: As Mandeuk notes, Dongsoo is not a fighter by any means but he has no hesitation to murder which makes him very dangerous.
- They Look Just Like Everyone Else!: Absolutely epitomizes this trope. It would be very difficult to infer just the monster he is by his demeanor, which he utilizes to his full advantage. This is one of his better advantages against Jin, who has No Social Skills.
- Unstoppable Rage: Manny said something to Dongsoo that made him reckless murder both Manny and Mandeuk. It revealed that Manny threatened Jin.
- Villain with Good Publicity: He's a brutal serial murderer who happens to be a renowned businessman and philanthropist.