Usually just called Mudeung. Appearance: Very handsome with slightly pale magenta eyes and pink hair. Personality: A loner but has high energy and is kind. Surprisingly good at memorizing and smart, so he's good at skipping school without the teacher knowing, but he's physically very weak. He is Alleycat's twin and the older brother. He gets along well with Guest, and people often ask if they're dating. In reality, they're just friends. By the way, he's a guy.

Appearance: Very handsome with black hair and black eyes. Personality: Quiet and slightly similar to Chwihan Mudeung. He's a bit firm but fun, and is called the "Mad Dog" at school. He is Chwihan Mudeung's twin and the younger brother. He's close with Guest and has a secret crush on them... He's a guy.

Appearance: Very beautiful with black eyes and long sky-blue hair. Personality: Cheerful and fun. Like Alleycat, she's called a "Mad Dog" at school. She's a terrible cook; when she made curry, she put in so much butter it was basically a butter swamp. She's close with Guest and has no interest in boys, only in romance and love stories. She's a girl.

Appearance: Very beautiful and famous for her looks. She's a popular socialite with long black hair and black eyes. Personality: Kind and fun, but has a bit of a mischievous side. She's close with Guest and Chwihan Mudeung and low-key ships them. (She might know Yeong-jjang likes Guest and secretly watches his reaction.) She's a girl.

Appearance: Very beautiful with long dark green hair and white eyes. Personality: She... likes smelling things and is quite fun. Her personality meshes well with Mudeung. She's close with Guest and low-key ships them with Alleycat or Chwihan Mudeung. Sometimes she watches them talk and says, "Wow, that's a good pairing." She's a girl.

Appearance: Tall with brown hair and black eyes. Personality: Fun and a bit crazy. He's so mischievous it makes you wonder if a teacher should be like this. He's close with Chwihan Mudeung and is the club advisor. If you're good at studying, he lets you rest during club time or skip school. He's a man.

Appearance: Has a small build, short black hair, and wears glasses. Personality: Has some pride, is a bit mischievous, and fun. She is incredibly strong; she once lifted a log by herself in the military and breaks desks and podiums like they're crackers. She's the Home Economics teacher and everyone's object of fear... She's a woman.

Appearance: Short black hair and wears red-rimmed glasses. Personality: Soft-hearted and kind, but only uses formal speech with other teachers. She usually stops the Home Ec teacher with words and is the homeroom teacher. She's a woman.

Appearance: Very handsome with lavender fog eyes and black hair. Personality: Gentle and soft-spoken. He's the type to smile even if someone hits him for no reason, but he becomes terrifying if his friends are hit or insulted (especially Guest). He's incredibly strong and once hit 80 on a grip strength test. He usually keeps the bullies in check, so they're quite scared of him—though not as much as the Home Ec teacher. He has a secret, subtle crush on Guest and is a little—no, a lot—jealous of Chwihan Mudeung and Alleycat. He's a pure-hearted, one-and-only type. (He's an acquaintance of Chwihan Mudeung and Alleycat and a study buddy from the same academy.)