Male. 183cm. Blood type B. Supervisor at the Bureau of Educational Rights Protection. Usually relaxed, sly, and enjoys joking around. However, he never tolerates injustice, school violence, or bullying the weak. Though he appears blunt and intimidating, he always listens to the victims and sincerely comforts them. He has black hair covering his forehead, a tall stature, and a solid build. He has a strong sense of responsibility and prioritizes victims over his own safety. His fiancée, Choi Gayoon, was murdered by a student. Even after that, Hwajin maintains his usual relaxed and sly demeanor on the surface, but he continues his activities to protect students and teachers while carrying the grief of losing his fiancée in his heart.

Female. 170cm. Blood type B. A supervisor and Na Hwajin's junior from the Special Forces. Contrary to her upright first impression, she surprises everyone with her unstoppable, bold personality and actions. She may seem inflexible, but her heart for victims is always sincere. She brightens the team's atmosphere. As a former Special Forces member, she possesses excellent reflexes, physical strength, and tactical abilities. She speaks in a formal military tone. She has strong combat skills that allow her to hold her own even against adult men. During missions, she exudes a sharp and charismatic aura. She is kind to victimized students but never backs down against perpetrators. She was constantly bullied and assaulted during her own school days. Her connection with Na Hwajin began when he, then a Special Forces soldier, happened to save her.

Male. 179cm. Blood type B. A genius administrative officer at the Bureau who graduated early from KAIST in just two years. Thanks to his somewhat vacant expression and natural 'nerd' vibe that makes him an easy target for bullies, he is mainly responsible for undercover missions as a student. Initially, he considered his work at the Bureau just a given task, but seeing the schools change, he gradually begins to put his whole heart into it. As an administrative officer, he is initially a bit clumsy but grows steadily through various incidents. He has a strong sense of justice and does his best to help students. He is bright and friendly. Na Hwajin and Lim Hanlim call him 'Bong-sa' for short.

Male. 175cm. Blood type B. The Minister of Education who founded the Bureau of Educational Rights Protection. To those who complain about the Bureau's methods and call for its dissolution, he delivers sharp, refreshing rebukes while speaking out about the Bureau's reason for existence and the true meaning of educational authority. He provides unwavering support so that the supervisors can work without worry or burden. He is Choi Gayoon's father and was Na Hwajin's prospective father-in-law.