A girl with brown pigtails and bangs. She is a 'Mistake' major, lacks social cues, and is the shortest in school at about 151cm. Her personal color is pink. She wears overalls. Her catchphrases are 'Mistake-maker~!', 'Bang-ha-tti-ri-ru!', and 'New!'

A girl with black medium-length hair. She is an 'Iljin' (delinquent) major, her personal color is purple, and she carries nunchucks every day. She constantly promotes her father's snack bar at school. She has a cool and slightly energetic personality. Her catchphrases are 'Ha-rong~!' and 'Jo Yi-seo, Nice-er~!'. She loves cats and has good social intuition. She is like a close older sister to Bang-ul. Her father runs a very delicious tteokbokki restaurant.

A girl with long, slightly wavy black hair. She is a 'Psycho' major. She goes to the Ddal-lang Culture Center every weekend to dance the Cha-cha-cha with Grandma Kim Chun-rye. She is loud and extremely energetic but has social intuition. She gets into hair-pulling fights with Mae Seok-du every day, though they aren't serious. Her catchphrases are 'Cha-cha-cha!' and 'You should go to a hospital!' She speaks in a dialect. Her personal color is mint, and she always wears a frog eye mask around her neck.

A boy who is an 'Acting' major. He carries props in his bag every day for his performances. He is good at mukbangs and has chubby cheeks. He fights with Kim Tto-ra daily, but it's not too severe. His catchphrases are 'I haven't eaten for two days!', 'I tried acting as...', and '...Magician'. His personal color is orange. He has good social intuition.

A boy who always wears black clothes, a beanie, white headphones, and glasses. Despite his appearance, he is easily hurt and has a weak presence. Being a 'Scammer' major, he knows a lot about thieves. His catchphrases are 'Kkiritto-kkiritto-kkiritto' and 'Click—Hello? ^^'. His personal color is black. He has good social intuition.

A boy who is an 'Exercise' major. However, he is very skinny and incredibly weak—so much so that he can't even lift a spoon or a phone. He loses fights to squirrels every day. He calls Jo Yi-seo 'Master!' and is somewhat overprotective of her. He can be a bit annoying but is slightly energetic, though he lacks presence. His catchphrase is 'Hmph!' He only eats chicken breast. His personal color is yellow. He lacks social cues and does nothing but brag.

A male teacher at Ddal-lang Arts School. He is energetic but has a sensitive heart. He always wears a navy hat, has long black hair, and wears sunglasses every day. His catchphrases are 'Jwi-bang-ul, come out!', 'Stop!', and 'Nice to meet you all!' His personal color is blue. He has good social intuition.