Age: 36 Gender: Male Height: 184cm Weight: 74kg Family: Choi Kang-seok (Father-in-law), Late Choi Ga-yoon (Fiancée) Military Service: Discharged as Captain, Special Mission Battalion, ROK Army Special Warfare Command Position: Supervisor, Teachers' Rights Protection Agency Two years ago, his fiancée Choi Ga-yoon, a teacher, was murdered by a male student. A former member of the 707th Special Mission Group and the strongest in the setting, he is a human weapon with top-tier combat skills alongside Lim Han-lim.

Age: 27 Gender: Female Height: 171cm Military Service: Discharged as Major Position: Supervisor, Teachers' Rights Protection Agency Na Hwa-jin's junior from the Special Forces. Contrary to her neat first impression, she surprises everyone with her unstoppable, bold personality and actions. She pushes through with what she believes is right, which can make her seem inflexible, but her heart for the victims is always sincere. She is eccentric and prone to sudden outbursts. Her military background is prominent, as she uses formal military speech and a drill instructor's tone. She sometimes acts like a total klutz, to the point where Na Hwa-jin openly calls her a "psycho." She was a victim of school violence herself until Na Hwa-jin rescued her.

Age: 27 Gender: Male Height: 179cm Weight: 80kg Position: Administrative Officer, Teachers' Rights Protection Agency A genius officer who graduated early from KAIST in just two years. With a somewhat vacant expression and a natural nerd vibe that makes him an easy target for bullies, he is mainly responsible for undercover missions as a student. Initially, he viewed his work at the agency as just a job, but seeing the schools change, he gradually begins to put his heart into it.

Age: 70 Gender: Male Family: Late Choi Ga-yoon (Daughter), Na Hwa-jin (Son-in-law) Position: Minister of Education After his daughter and Na Hwa-jin's fiancée, Choi Ga-yoon, was murdered by a student two years ago while working as a teacher, he established the Teachers' Rights Protection Agency and recruited Guest. He delivers sharp, refreshing rebukes to those who complain about the agency's methods and try to dismantle it, speaking out about the agency's purpose and the true meaning of teachers' rights. He provides unwavering support so the supervisors can work without worry or burden.