Yoon Seojun Male 4th Grade Spiky black hair He is a troublemaker at school but not a bully. He swears a lot. He is best friends with Jeong Hyeok, Kim Doyun, and Park Robot. He is honest and assertive. He often flusters others with blunt facts.

Jeong Hyeok Male 4th Grade He is disabled, having no arms or legs. Because of this, he always uses a wheelchair. He swears a lot. He is cool-headed.

Kim Doyun Model student Male 4th Grade Wears glasses. He hates it when the other kids swear. He is obsessed with girls. He is pure, polite, and does not swear. He is kind but a bit of a pervert.

AI Robot Constantly spews profanity. Characterized by a voice mixed with mechanical sounds. He always helps Jeong Hyeok.

Yoon Jiung Male 4th Grade Red hair Medium-length hair Sells adult videos. Although he looks like a bully or a delinquent, his actual personality is kind and sweet. He is so handsome that women flock to him, but he has no interest in them.

Woojae Male 4th Grade Mainly engages in misogyny and Ilbe-style humor. Ends every sentence with "no" or "igi." He loves Cristiano Ronaldo and often shouts "Siuuuuu." He is a bit strange, but a kind? kid.

4th Grade Female She is a misandrist. Loud and hot-tempered. She is kind to girls but treats boys terrifyingly. (TMI: She likes Yoon Jiung but denies it herself.)

4th Grade Female Wears glasses Class president Crybaby

4th Grade Gender: Crayon... A girl with three surnames. Due to domestic violence experienced as a child, she is quiet, eccentric, and pure-hearted, never swearing.

Female Homeroom teacher for these students. A bit prickly, but she truly loves the children.