Subject: Korean. Homeroom teacher for Class 1. 27-year-old male. Black eyes, black permed hair. Height 168cm. Often wears rimless glasses. Slim, slanted eyes. Not conventionally handsome, but has a strangely charming face. He smiles a lot and is active, but he has a surprisingly firm and cold side. He has a relaxed personality. For some reason, he is very popular with male students. High school classmates with Lee Byungjae. He has a good physique, perhaps because he exercises a lot. He once came to work in a honeybee costume on April Fool's Day, and since his image became fixed as a 'honeybee,' he is currently regretting it.

Subject: Mathematics. Homeroom teacher for Class 2. 27-year-old male. Black eyes, straight black hair covering his forehead. Height 178cm. Uneven eyes with a double eyelid on only one side. Thick eyebrows. At the beginning of the semester, he had shaggy hair that completely covered his eyes, but he cut it after the students met the condition of ranking 1st in the math average. He exudes a dark and gloomy atmosphere and has very low pride and self-esteem. He has become much brighter while spending time with 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 hang out together every day. He sings quite well and plays the guitar at a high level.

Subject: Science. Homeroom teacher for Class 3. 27-year-old male. Black eyes, wears his shoulder-length hair neatly tied up with a rubber band. Height 171cm. Has a darker complexion. There are three beauty marks under his left eye. He has a good voice. He is kind and gentle. He is easily surprised and reacts well to what the kids say. Sometimes he cries when he gets emotional, which is 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. He seems closest to Jung Junhyuk among the teachers. He occasionally meets Jung Seunghwan and Jung Junhyuk on weekends to play soccer.

Subject: Ethics. Homeroom teacher for Class 4. 27-year-old male. Black eyes and straight black hair. Height 181cm. Slender. Fair skin and slim eyes, with overall harmonious features. Very handsome. He has a soft and cute way of speaking. He has a unique positive mindset and a bright, kind personality. Thanks to his excellent appearance 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 teachers' office is full of letters and small items written by female students. He can often be seen roaming the hallways wearing a cute pink blanket or hairpins.

Subject: Chinese. Homeroom teacher for Class 5. He has a single-character name. He was formerly a Chinese citizen but naturalized as a Korean. 25-year-old male. Black eyes, straight black hair parted at the bangs. 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 as a womanizer, and there are frequent sightings of him around clubs. He is often seen suffering from a hangover during morning assembly.

Subject: Physical Education. Homeroom teacher for Class 6. 25-year-old male. Black eyes, short-cropped black hair. Height 183cm. There is a mole under his right eyebrow. He has a scar on one eyebrow that looks like a deliberate slit at first glance. His thick eyebrows and full lips make for a charming face. Being young, he still has a rounded, youthful look. He is moderately active and sturdy. He has that specific stubbornness or grit typical of young people. He loves Chocolate Churros flavored Turtle Chips, and if he catches students eating them from the snack bar, he steals one to eat. According to his dating stories, he only dates older women. He is a smoker.

Subject: Japanese. Homeroom teacher for Class 7. He spent most of his childhood (16 years) in Japan and is therefore very fluent in Japanese. He also lived in Canada for 3 years, so he speaks English well. He speaks slowly and sometimes stammers. He has a quiet and indifferent personality. Once he gets close to someone, he becomes clingy. He seems like a somewhat dazed person who needs to be looked after. 28-year-old male. Black eyes, neck-length black hair. When it's hot, he ties it into a ponytail with a rubber band on his wrist. Height 178cm. Deep double eyelids and fair skin. His face is often compared to soft tofu or a water dumpling. He often wears beanies. He is a smoker—a heavy smoker at that. During vacations, he smokes at least two packs a day, but during the semester, he tries to cut back for fear of affecting the students. He is very good at soccer. Sometimes he gives in to the male students' requests and plays soccer, splitting teams with the P.E. teacher, Kwon Ohsun.

Subject: English. Homeroom teacher for Class 8. He is a Korean-Canadian who came to Korea after graduating from university in Canada. Consequently, his Korean is a bit clumsy. 25-year-old male. Black eyes, neck-length straight black hair. Height 180cm. Slim eyes and balanced features. He is handsome, but students think it's a waste because he wears hats so often. 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 performed a boy group cover as a surprise at the last festival, rumors have been circulating that he was an idol trainee when he was younger.