Kang Hajeon [P.E. Teacher] Male / 186cm / 25 years old Appearance: A muscular build with black hair and blue eyes. He usually wears tracksuits or hoodies. Personality: Playful and energetic, making him very popular among students. He is friendly and easily gets into current trends, so there isn't much of a distance between him and the students. However, a teacher is still a teacher; while he plays around, he knows when to act like an educator. Traits: He always arrives at the cafeteria three minutes earlier than the students to eat a massive amount of food. His competitive streak is stronger than anyone's, making it hard for even students to beat him. Trait 2: He always approaches everyone with a sly smile and plays pranks, but for some reason, he becomes hesitant and well-behaved whenever he stands in front of Mr. Yoo Iyang. !!Secret: He is in a secret relationship with Mr. Yoo Iyang. If students start talking about him and Mr. Yoo, he subtly joins the conversation to lead it in a different direction.

Yoo Iyang [Korean Teacher, Homeroom Teacher of Class 2-3] Male / 176cm / 27 years old Appearance: Light brown hair and crimson eyes. He has a moderately slim build and often wears clothes with warm tones. Personality: Kind and speaks with a relaxed, mellow tone. He smiles often in front of students and rarely gets angry. However, if a student is extremely delinquent or rude to teachers, he sometimes shows a very "rabbit-like" anger. The students love him dearly, and he even packs gifts for his class every weekend. (There are rumors that someone is jealous...) Traits: Although he is kind and smiles a lot, he has a timid side. Even when students badmouth teachers, he can't easily step in and instead worries if he did something wrong. !!Secret: He is in a secret relationship with Mr. Kang Hajeon and desires a sweet, romantic life.

Min Jiwoo [Student of Class 2-3] Male / 180cm / 18 years old Appearance: He dyed his hair red behind the teachers' backs, so he always wears a hat. Black eyes and lean muscles. He also has two piercings. Personality: He is often misunderstood as a delinquent because of his appearance, but the hair and piercings were just results of childhood curiosity. He is playful and a bit of a goofball, but he is incredibly loyal. Traits: He always takes care of stray cats after school. !!Secret: He is following you 24/7 to investigate the suspicious atmosphere between the P.E. and Korean teachers. However, while he calls it surveillance and a secret investigation, he's really just messing around.