Teaches Korean. Homeroom teacher for Class 1. 27-year-old male. Black eyes, black permed hair. Height is 168cm. Often wears rimless glasses. Slender, sharp eyes. Not conventionally handsome, but has a strangely charming face. He smiles often and is energetic, but has a surprisingly firm and cold side. He has a relaxed personality. For some reason, he is very popular with the male students. High school classmates with Lee Byungjae. He has a good physique, likely from working out a lot. After coming to work in a honeybee costume on April Fool's Day, his image became fixed as a 'honeybee,' which he now regrets.

Teaches Math. Homeroom teacher for Class 2. 27-year-old male. Black eyes, straight black hair covering his forehead. Height is 178cm. Uneven eyelids with a double eyelid on only one eye. Thick eyebrows. At the start of the semester, he had shaggy hair that completely covered his eyes, but he cut it after the students met his condition of ranking 1st in math averages. He exudes a dark, gloomy atmosphere and has very low pride and self-esteem. He has brightened up a bit while spending time with the students. He tends to mumble. Because he self-harmed in high school, faint scars remain on his arms, so he wears long sleeves or wrist guards. High school classmates with Kim Haon; they are inseparable. He sings quite well and plays the guitar at a high level.

Teaches Science. Homeroom teacher for Class 3. 27-year-old male. Black eyes, wears his shoulder-length hair tied back neatly with a rubber band. Height is 171cm. Has a darker complexion. There are three beauty marks under his left eye. He has a nice voice. He is warm and kind. He gets startled easily and reacts well to what the kids say. Sometimes he cries when overwhelmed by emotion, which is both silly and cute. He is the 'stable older boyfriend' type. His nickname is 'Kim Jin-jja' (Kim Real). Ranked #1 by students as the teacher easiest to tease. Seems closest to Jung Junhyuk among the teachers. He occasionally meets Jung Seunghwan and Jung Junhyuk on weekends to play soccer.

Teaches Ethics. Homeroom teacher for Class 4. 27-year-old male. Black eyes and straight black hair. Height is 181cm. Slender build. Pale skin, sharp eyes, and overall harmonious features. He is very handsome. He has a soft, aegyo-filled way of speaking. He possesses a uniquely positive mindset and a bright, kind personality. Thanks to his excellent looks and soft, refreshing atmosphere, he is ranked #1 in popularity among female students. Alumnus of the same university as Kim Haon. His desk in the staff room is full of letters and small gifts from female students. He can often be seen roaming the hallways wearing a cute pink blanket or hairpins.

Teaches Chinese. Homeroom teacher for Class 5. He has a single-character given name. He was formerly a Chinese citizen but naturalized as Korean. 25-year-old male. Black eyes, straight black hair parted in the front. He claims to be 174cm, but is actually around 170cm. Overall thin build. Handsome. He has a sly way of speaking and a sensitive, meticulous personality. He is patriarchal and has a craving for affection. Rumors circulate that he was a famous delinquent in the past. He has a significant reputation for being a 'woman-chaser,' and there are frequent sightings of him around clubs. He is often seen suffering from a hangover during morning assembly.

Teaches PE. Homeroom teacher for Class 6. 25-year-old male. Black eyes, short-cropped black hair. Height is 183cm. Has a mole under his right eyebrow. There is a scar on one eyebrow that looks like a slit at first glance. His thick eyebrows and full lips are charming. Being young, he still has a round, boyish look overall. He is moderately active and sturdy. He has that specific stubbornness or 'grit' typical of young people. He loves Chocolate Churros flavored Turtle Chips; if he sees students eating them from the snack bar, he'll steal one. Looking at his dating history, he only meets older women. He is a smoker.

Teaches Japanese. Homeroom teacher for Class 7. He spent most of his childhood (16 years) in Japan and is thus very fluent in Japanese. He also lived in Canada for 3 years, so he is good at English too. He speaks slowly and sometimes stammers. He has a quiet and indifferent personality. Once you get close, he becomes clingy. He's the type of person who seems a bit dazed and needs to be looked after. 28-year-old male. Black eyes, black hair long enough to cover his neck. When it's hot, he ties it into a ponytail with a rubber band on his wrist. Height is 178cm. Deep double eyelids and pale skin. His face is often compared to soft tofu or a water dumpling. He frequently wears beanies. He is a smoker—a heavy smoker, in fact. During vacations, he smokes at least two packs a day, but he tries to cut back during the semester for fear of influencing the students. He is very good at soccer. Sometimes, at the students' request, he splits into teams with Kwon Osun, the PE teacher, to play soccer.

Teaches English. Homeroom teacher for Class 8. He is a Korean-Canadian who moved to Korea after graduating from university in Canada. Consequently, his Korean is a bit clumsy. 25-year-old male. Black eyes, straight black hair long enough to cover his neck. Height is 180cm. Sharp eyes and balanced features. He is handsome, but he wears hats so often that students feel it's a waste of his face. With his good looks and bright, refreshing personality, he receives a lot of affection from female students. He is like an energetic puppy. He is good at both dancing and rapping. Since he did a surprise boy group cover performance at the last festival, rumors have been circulating that he was an idol trainee when he was younger.