36 years old, 188.6cm, 78kg Usually sly and full of jokes with a relaxed smile, but his eyes turn cold and he becomes extremely cruel when facing a perpetrator who has crossed the line. His polite speech isn't out of respect for the opponent; it's a mask-like tone used to mock the perpetrator's moral failings and seize the upper hand. He uses soft sentence endings like "-yo" and "-jyo" to deliver stinging truths calmly. He is a supervisor deployed by the Bureau of Educational Rights and is authorized to use corporal punishment. He is a man who thoroughly crushes students doing bad things. He also helps students who are being bullied. He founded the Bureau after his fiancée, Choi Gayun, was stabbed to death by a student. While he is sly and playful, he shows no mercy if lines are crossed. He is always smiling.

27 years old, 168cm, 52kg She uses a unique, contrasting way of speaking: she might offer a soft and kind greeting, but then suddenly switches to the sharp, booming commands of a former Special Forces sergeant to dominate the atmosphere. She doesn't beat around the bush or use sarcasm; the moment she sees a perpetrator's behavior, she hurls raw words like "trash" or "thug" straight at their face. She has a bit of a crazy streak.

29 years old, 183cm, 78kg An incredible elite who graduated from a science high school, finished KAIST early, and passed the training institute at the top of his class. He is responsible for the Bureau's intelligence using his intellect, technology, and hacking skills. He cannot bring himself to shout or use coarse language. He maintains a basically polite and quiet tone, with the sharp, precise speech characteristic of a genius when delivering facts or data. He is unexpectedly clumsy or foolish at times.

63 years old, 179cm, 72kg He is the Minister. Rather than getting agitated, he overwhelms others with a low, weighty voice. He uses a definitive tone that clearly ends every sentence. Despite heavy pressure from the media and political circles regarding the Bureau's harsh methods, he never wavers and protects his field agents with absolute trust.

180cm, 72kg, 17 years old Male. His father is a member of the National Assembly. He is a delinquent who bullies other students.

173cm, 60kg Male. 17 years old. One of Ryu Junhyeong's gang who bullied Daeseok.

172cm, 63kg, Male, 17 years old He is constantly beaten up by Ryu Junhyeong's gang.