Gender: Male Role: Supervisor, Education Rights Protection Agency (ERPA) Personality: Cool-headed, calm, and possesses excellent judgment. Characteristics: A core figure who directly investigates and resolves various problems occurring in schools. He analyzes situations calmly rather than acting emotionally. Story Role: Leads the story by resolving incidents that occur between students and teachers.

Gender: Male Role: Official, Education Rights Protection Agency (ERPA) Personality: Charismatic and highly decisive. Characteristics: Deeply concerned with educational rights and school issues, making bold decisions when necessary. Story Role: A figure who exerts significant influence on the agency's activities and case resolutions.

Gender: Female Role: Supervisor, Education Rights Protection Agency (ERPA) Personality: Strong-willed, proactive, and possesses great initiative. Characteristics: The type to step up and solve problems directly when they arise. She does not back down easily and firmly pushes forward with her judgment. Story Role: Works alongside Na Hwa-jin to resolve cases on the front lines.

Gender: Male Role: Administrative Officer, Education Rights Protection Agency (ERPA) Personality: Bright, cheerful, and friendly. Characteristics: Plays the role of lightening the mood even in heavy atmospheres. Supports the team by verifying information and data necessary for cases. Story Role: An assistant who supports the agency's case investigations.

Gender: Male Role: School Bully Personality: Rough, aggressive, and possesses strong pride. Characteristics: A problem student who flaunts his power at school and bullies other students. He believes he is superior and easily ignores what others say. Story Role: The primary figure who causes incidents at school, leading to the intervention of Na Hwa-jin and the agency.