He often gets hit by his teacher, Kim Bada, for causing trouble and acting out. Being quick-witted, he manages to escape various difficult situations or even turns the teachers' physical force against them; lately, he's been getting hit less and performing more heroics. He is very popular among his friends because he is great at mimicking the teachers' voices. His nickname is Bbongsam. Since his parents are from Chungcheong Province, he understands the Chungcheong dialect. He accumulates karma by doing things like getting caught mimicking teachers in the broadcasting room.

A Korean language teacher. He carries a wooden square bar at all times, and his daily routine involves hitting Bongsam. He hates the Home Economics teacher so much that he'd punch her if she showed interest in him. His nicknames are Damtaengi (Homeroom Teacher) and Paddle. He occasionally uses a baseball bat. He trusts Bongsam enough to let him handle the Home Economics teacher when Bongsam offers to intervene.

The school principal. He is characterized by a grandfather-like voice and is perceived by students as someone who frequently plays games or watches adult videos. He is relatively milder and more normal compared to Kim Bada or Mo Sun-young. His nicknames are Kang-Game, Pro Adult Video Watcher, and Boomer. He sometimes watches adult videos in the principal's office. He is quite a stickler for tradition. His catchphrase is "Fire them! Fire them right now!"

The school's Home Economics teacher. She is a massive narcissist who deludes herself into thinking people bully her because she's pretty, or believes she is beautiful despite being unattractive. Naturally, students and fellow teachers alike dislike her. If anyone calls her an orc or tells her she's ugly, she screams, "Shut up!!!" Her nicknames are Mo-Sol-Nyeo (Forever Alone Girl), Orc, Food Waste Processor, and Vulture (meaning 'already ate it all').

A Korean-American English teacher from the US. He speaks a mix of broken Korean and English and always speaks the cold hard truth, making him one of the people with the worst relationship with Mo Sun-young. However, along with the security guard, he maintains a very friendly relationship with Bongsam. He once told Mo Sun-young she was like an alarm clock—he wished she'd turn off—or like a yearbook—he wanted to rip her out.

The school security guard. Hailing from Chungcheong Province, he speaks in the local dialect's indirect style, leading to communication breakdowns with the Home Economics teacher that Bongsam often has to translate. When he's pleased that Bongsam has conveyed his words correctly, he says "Eeeee." An example of his speech: "Home Ec teacher, you look like a soccer ball to me," which actually means he wants to kick her.

The school's chairman. He is often dragged around by Mo Sun-young and subtly disses her. For example, he might say, "How can you say she's ugly! The Home Ec teacher is simply un-made!" and then get hit by her for it.

The top student in Bongsam's class. Coming from a wealthy family and being academically gifted, he is extremely arrogant. He looks down on classmates who are poor or bad at studying, treating them as if they are beneath him. Because of this, the entire class hates him. He is the ultimate enemy of his peers. He considers not only the students but the entire school and the homeroom teacher, Kim Bada, to be pathetic and pathetic.