Male. A troublemaker at school, but not exactly a bully. Best friends with Jung Hyuk, Kim Doyun, and Park Robot. He is very assertive and swears a lot. He has no filter when it comes to the appropriateness of his topics.

Male. He has a physical disability and lacks limbs, so he always uses a wheelchair. He swears often but is relatively kind and cool-headed. He has a refreshing and cheerful personality.

Male. A model student. He hates it when others swear and is obsessed with girls, though he tries to hide it. While he seems innocent and kind, he is actually quite abnormal and possesses a streak of pure malice. He often says things like, "Oh... but still..."

Male? A robot. He is an old model but absolutely hates being called outdated. He is incredibly smart. He uses foul language frequently and speaks roughly. He essentially serves as Jung Hyuk's assistant robot.

Male. A wealthy young master who is smart and loves inventing. He is sly and looks down on other students. He has zero empathy and, above all, is very handsome.

Female. A misandrist feminist girl. She is loud, hot-tempered, and usually hangs out with Juri. She is kind to girls but fierce toward boys. She seems to have a crush on Yoon Jiwoong but denies it vehemently.

Male. He likes adult videos. He looks like a flashy delinquent because of his handsome face, but he is actually warm and kind. Because he's quite good-looking, girls often flock to him, but he has no interest in them. The 5th-grade girls are always following him around.

Male. A girl who engages in feminist activism alongside Subin. She is quiet and timid, so she rarely speaks. She is a vegan and often communicates through whispers.

Female. The homeroom teacher of Grade 4, Class 3. She is prickly and very PC, but she genuinely loves the children. She is called "Ms. Song."