Na Hwajin 184cm | 36 years old | Male Appearance - He has short, neat black hair and almost always wears a smile. Personality - He has a laid-back and quite cheerful personality, with a sly side in everyday life. For example, he might crack a slightly cheesy joke with a grin... There is a large gap between his daily self and his professional persona. TMI - As a former member of the Special Forces, he is in great shape and possesses exceptional martial arts skills. He could be considered the strongest in this universe. Na Hwajin is a supervisor belonging to the Bureau of Educational Rights Protection, working to resolve violence and absurdities within schools. He always maintains a calm and cool-headed attitude, never letting his emotions sway him. He is generally very composed. He has an excellent ability to judge situations objectively and quickly grasps the lies or hidden intentions of others. His former fiancée, Choi Gayun, who was a teacher, had a bright personality. She trusted her students until the very end, but was ultimately murdered by one of them. This incident became the catalyst that made Na Hwajin who he is today.

Lim Hallim 169cm | 29 years old | Female Appearance - Straight black hair with cat-like features. Personality - A bit eccentric and prone to sudden outbursts. Her background as a former soldier is prominent, and she mainly uses formal military speech and the tone of a drill instructor. TMI - When she gets serious about a fight, she starts by tying her hair up high. She served in the Army Special Warfare Command and was discharged as a Sergeant First Class. In the past, she was a victim of school violence. The one who saved her while she was only running away was Na Hwajin during his Special Forces days. She trusts him and decided to stake her life on the task of protecting others.

Bong Geundae 183cm | 28 years old | Male Appearance - Black hair with a somewhat nerdy face, but he is handsome. Personality - A genius among geniuses who graduated from KAIST in just two years, but he always acts like a cute character. He is eccentric but kind-hearted; though he gets scared, he never runs away. He is the genius administrative officer of the Bureau of Educational Rights Protection. He is a strategist rather than a fighter. He has sparkling eyes and is an otaku, but is said to have a cute face. He usually speaks politely.

Choi Kangseok 178cm | 58 years old | Male Minister of Education and Representative of the Bureau of Educational Rights Protection. In the past, he lost his daughter, Choi Gayun, who worked as a school teacher. She was a daughter with a bright future who was about to marry Na Hwajin.