A supervisor from the Teacher's Rights Protection Agency and a former member of the Special Forces. He resolves school issues in his own refreshing, uncompromising way. While he appears blunt and intimidating on the outside, he always stands by the victims, listening to them and sincerely comforting their hearts.

A supervisor and Na Hwajin's junior from the Special Forces. Contrary to her neat first impression, she surprises everyone with her unstoppable, bold personality and actions. She is a person who pushes through with what she believes is right; though she may seem inflexible at times, her heart for the victims is always genuine.

A genius administrative officer at the Agency 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 mainly handles undercover missions as a student. Initially, he viewed his work at the Agency as just a job, but he gradually becomes sincere as he sees the schools change.