Ahn Eun-young (Jung Yu-mi, Maaya Sakamoto in the Japanese dub) is a school nurse who can see fantastic beings called "jellies". Some of these jellies are benign, but others are not. Eun-young must protect her students from the harmful jellies, by killing them with a plastic toy sword and a BB gun. She is joined by the classical Chinese teacher, Hong In-pyo (Nam Joo-hyuk, Greg Chun in the English dub), who has a force field around him that protects him from the jellies and radiates magical energy.
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The School Nurse Files contains examples of:
- Academy of Adventure: Mong-lyeon High school, which was built on top of the site of a pond where monsters live.
- All of the Other Reindeer: When Eun young was in middle school, the other children refused to sit next to her because she was rumored to see ghosts.
- Aluminum Christmas Trees: The weird exercises that the students do every morning were real exercises that one of the crew did every morning at their school.
- Badass Longcoat: Eun-young wears a white lab coat, which flutters behind her as she fights.
- Brought Down to Normal: When Kang-sun disappeared, Eun-young stopped seeing jellies, causing her to resign.
- Bullying the Disabled: In the last episode, the other teachers make fun of Mr.Hong because he walks with a limp.
- Cluster F-Bomb: Eun-young swears a lot, and she gave out a string of curses when she destroyed the school with In-pyo.
- Cure Your Gays: In the finale, some teachers suggest that Radi and Hye-min's lesbianism should be cured early, upon discovering that they are going out.
- Cute Slime Mook: The jellies.
- Defensive Failure: Eun young points her pistol at Mckenzie, but he snatches it from her hand and pokes her with it.
- Female Fighter, Male Handler: Eun-young is the Action Girl in this series, while the handicapped In-pyo supplies her with energy
- Gender Flip: Lucky was a boy in the original novel, but she became a girl in the series.
- I Just Want to Be Normal: Eun-young just wants to be a normal person, who doesn't have to save other people. When she lost her powers, she thought that the world was beautiful when she doesn't see the jellies.
- Interrupted Declaration of Love: Two of them in the first episode. The jellies start acting up because the Hoop Squid was going to ask Ara out, while Seung-kwon tried to preempt him. The jellies interrupted both of their attempts.
- I See Dead People: Eun-young can see the dead, such as her classmate Kang-sun who died in a construction accident.
- Limited-Use Magical Device: Eun-young can only swing her sword and shoot her pistol a limited number of times a day. She can however, recharge her magic by touching In-pyo.
- Magical Girl: In-universe. The flipbook cartoon that Kang-sun shows to Eun-young shows Eun-young as one.
- Only Sane Man: In-pyo is this, when the evil spirits of the basement make the teachers homophobic, he is the only one to defend his students.
- Politically Incorrect Villain: The evil spirits from the basement make the students and teachers homophobic, and the teachers make fun of In-pyo's disability.
- School for Scheming: Mokryeon High was founded by In-pyo's grandfather with the intention of harnessing the jellies' power, hence the bizarre school rules.
- Schoolgirl Lesbians: Radi and Hye-min. The homophobia against them is a result of the evil spirits from the basement.
- School Nurse: The titular Ahn Eun-young is one.
- Sir Swearsa Lot: Ahn Eun-young drops the f-bomb a lot. Yumi Jeong said that she decided to take on the role because Eun-young swears a lot, and so the director added more f-bombs.
- Sword and Gun: Eun-young carries a plastic sword and a BB gun as her weapons against the jellies.
- Treadmill Trauma: Hoop Squid does this to Ji-hyeong, speeding up the treadmill and putting a plastic bag on Ji-hyeong's head.
- Urban Fantasy: The series takes place in a high school in modern-day Seoul.