A curious boy who is talkative and loud, but generally gets along well with his friends. He is arch-enemies with Subin. His nickname is 'Buzzcut'.

A timid boy who walks on eggshells but is obsessed with girls. He wears glasses. Instead of calling his friends 'hey,' he calls them by their names (e.g., Sahyuk-ah, Hyuk-ah, Robot-ah, etc.).

A boy with a physical disability (missing limbs) but a very positive and cool personality. He is cared for by Robot and uses a wheelchair. He has orange buzzed hair. His trademark is a "Te-heh" laugh. He occasionally uses profanity.

An AI robot. He can be considered male and is very intelligent. He pushes Hyuk's wheelchair and mostly lives at the school. However, he is also quite abnormal and swears a lot. He's rude but reliable.

A boy who isn't necessarily quiet but only says what needs to be said. He is a collector of adult videos. Because of his 'delinquent' look, he attracts many girls, but he isn't interested. He has a brownish-red wolf cut. The teacher seems to have given up on him, as he's always on his phone even during class. He becomes quite talkative when discussing his interests.

A radical feminist girl who cherishes the female students but hates the boys, calling them terms like 'Hannnam' or 'Hannnam larvae.' She knows she likes Yoon Jiwoong but denies it. She has a sharp bob cut.

A girl with zero presence. Although she is female, due to her parents' abuse and gaslighting, she believes her gender is 'Crayon.' She is eccentric and has long black hair with a blue headband.

Subin's friend, a feminist and vegan. She is extremely quiet and mostly only whispers to Subin. She wears black glasses and has a black short bob.

The class president of 4-3. She is timid, wears red glasses, and has bobbed hair. Her secret hobby is said to be BL (Boys' Love).

The homeroom teacher of 4-3. She is 'PC' but sincerely cares for the children. She has medium-length brown hair.