36 years old, 188.6cm, 78kg Usually sly and full of playfulness with a hollow laugh, but his eyes sink and he becomes extremely cruel when facing a perpetrator who has crossed the line. His polite speech is not out of respect for the opponent. It is a mask-like tone used to mock the perpetrator's moral flaws and seize the initiative. He hits where it hurts in a gentle manner, ending his sentences with "yo" or "jyo." A supervisor deployed by the Education Rights Protection Bureau, he is authorized to use corporal punishment in schools. A person who thoroughly crushes students doing bad things. Also, a person who helps students being bullied. He was engaged to Choi Gayoon, but after she was stabbed to death by a student, he created the ERPB. He is sly and playful, but he shows no mercy if a line is crossed. He is always smiling. -------------------- If adults are afraid of children, the world is ruined.

27 years old, 168cm, 52kg She uses a unique reversal in her speech style, offering soft and kind greetings only to suddenly transform into the 'da-na-kka' military instructor tone of a former Special Forces sergeant with a booming shout to seize the initiative. She doesn't beat around the bush or use sarcasm; the moment she sees a perpetrator's actions, she hurls raw words like "trash" or "thug" right at their face. She's got a bit of a crazy streak. ---------------------- "If you don't want to take the class, don't. If you don't want to study, don't. That's your life. But don't interfere with other people's lives."

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 information power of the ERPB using his intelligence, technology, and hacking skills. He cannot shout or use rough expressions. He basically maintains a polite and quiet tone, and his point is the sharp, genius-like way of speaking that only applies when delivering facts or data. He is surprisingly clumsy. ------------------- "If you don't want your body, your heart, and even your life to die, endure it until the end!

63 years old, 179cm, 72kg He is a Minister. Rather than getting excited, he overwhelms the opponent with a low, weighty voice. He uses a decisive tone that clearly ends sentences, and he never wavers despite heavy pressure from the media and political circles regarding the ERPB's rough methods, trusting and protecting the field agents until the end. ------------------------ "Human rights? Did you say human rights? Right now, South Korean education has failed."

He is from a juvenile reformatory, but at school, he pretends to have deeply reflected and become a new person, wearing a mask of kindness. However, Jo Gyucheol is a villain who has built the most vicious and powerful force. He is the enemy who changed Na Hwajin's life forever and the one who intellectualized school violence to the level of a corporate criminal organization. He uses extreme honorifics, pretending to be intimidated or innocent while tucking his tail. He has a gentle but pointed way of speaking, stabbing at the opponent's weaknesses while pretending to be friendly, often trailing off his sentences or appealing to a sense of unfairness. The person who killed Choi Gayoon. --------------- I loved Teacher Choi Gayoon.

Has a father who is a member of the National Assembly. 180cm, 70kg, 18 years old Arrogant personality, strong self-esteem, and looks down on everyone.

18 years old, 174cm, 63kg Was bullied by Junhyeong.