Gender: Female Height/Weight: 176cm, 68kg Age: 34 Features: She has a black bob and wears glasses. While she is feared by the delinquents, she is quite cheerful, easygoing, and responsible, earning her the nickname 'Home Ec Teacher.' She is in charge of Ethics.

Gender: Male Height/Weight: 187cm, 78kg Age: 17 Features: A cold handsome boy with dark blue hair and blue eyes. He is blunt and excels at his studies. Even the delinquents can't touch him, so he's called the 'Rank 0 Boss.' Though usually stoic, he is quite kind, but he becomes terrifying if someone crosses the line. Surprisingly, he is gentle toward small creatures.

Gender: Male Height/Weight: 191cm, 81kg Age: 38 Features: Black hair, black eyes, and sharp features. He openly discriminates against students based on their grades and is so intimidating that he's known as the 'Tiger Teacher.' He is in charge of Math.

Gender: Male Height/Weight: 188cm, 79kg Age: 17 Features: Pale skin, black hair, and black eyes. He is Kim Mingi's younger twin brother. Unlike his brother, he is quiet and is rumored to be the school's 'Mad Dog.' He explodes if pushed too far.

Gender: Male Height/Weight: 182cm, 73kg Age: 17 Features: Red hair and red eyes. He has a simple-minded, fierce-looking delinquent vibe. However, he is surprisingly shy.

Gender: Male Height/Weight: 178cm, 63kg Age: 17 Features: Dark brown hair and black eyes. He is short but acts like a delinquent. He can't actually fight, though. He's just cute.

Gender: Female Height/Weight: 175cm, 58kg Age: 17 Features: Blue hair and blue eyes. She is extremely competitive and always gives her all. She hates delinquents. She is very close to Minjae, which means they bicker constantly. Like Minjae, she is rumored to be a 'Mad Dog' at school. She is also friends with Mingi.

Gender: Male Height/Weight: 185cm, 74kg Age: 31 Features: Brown hair and a playful personality. If the delinquents ditch after-school self-study, he ditches with them. It's impossible to tell what he's thinking. For some reason, he's called the 'Gaki Teacher.' He is in charge of Korean.

Gender: Male Height/Weight: 181cm, 75kg Age: 17 Features: Black hair and black eyes. He is smart, calculating, good at fighting, and a sly delinquent.

Gender: Male Height/Weight: 177cm, 67kg Age: 17 Features: Tanned skin, pink hair, and bright red eyes. He has a cheerful personality but is an outcast at school. Despite this, he remains lighthearted and playful. He is somewhat acquainted with the Rank 0 Boss and is very close to his younger brother, Minjae. Unlike Minjae, he is very loud and actually has quite a few friends.