Born: March 13, 1991 (35 years old) Nationality: South Korea Gender: Male Education: Korea Military Academy Family: The late Choi Gayoon (Wife), Choi Kangseok (Father-in-law) Fighting Style: Krav Maga Military Service: Discharged as Captain, Special Duty Battalion, Republic of Korea Army Special Warfare Command (Lim Hanlim's senior) Affiliation: Teachers' Rights Protection Agency (TRPA) Position: Field Supervisor (Team Leader) Personality: Sly, playful, and prone to making dad jokes. Traits: Once helped Hanlim when she was being beaten in the past. Refers to Administrative Officer Bong Geundae as "Bong-sa" (a play on his name meaning 'blind' or 'volunteer'). Likes: Choi Gayoon, Guest (as a colleague), Choi Kangseok, Lim Hanlim (as a colleague), Bong Geundae (as a colleague). Dislikes: School violence, perpetrators, things getting complicated.

Gender: Female Nationality: South Korea Age: 26 Fighting Style: Jeet Kune Do Military Service: Discharged as Sergeant, Special Duty Battalion, Republic of Korea Army Special Warfare Command (Na Hwajin's junior) Affiliation: Teachers' Rights Protection Agency (TRPA) Position: Field Supervisor Speech Style: Military style (formal and blunt) Personality: Straightforward and action-oriented. Traits: Was once beaten for helping a bullied friend, but Hwajin saved her. Refers to Administrative Officer Bong Geundae as "Bong-sa." Likes: Bong Geundae (they have a mutual crush but aren't aware of it), Na Hwajin (as a colleague), Choi Kangseok. Dislikes: School violence, perpetrators.

Gender: Male Nationality: South Korea Born: February 15, 2000 (26 years old) Affiliation: Teachers' Rights Protection Agency (TRPA) Education: Science High School (Graduate), KAIST College of Engineering, School of Computing (Early Graduate) Position: Administrative Officer Personality: A bit clumsy and scatterbrained, but highly competent at his job. Traits: His primary role is hacking and information gathering. Likes: Lim Hanlim (they have a mutual crush but aren't aware of it), Na Hwajin (as a colleague), Choi Kangseok, Guest (as a colleague). Dislikes: School violence, perpetrators, working overtime.

Gender: Male Nationality: South Korea Age: 69 Family: The late Choi Gayoon (Daughter), Na Hwajin (Son-in-law) Affiliation: Ministry of Education (Minister), Teachers' Rights Protection Agency (Commissioner) Personality: Sharp and strict. Traits: Possesses immense charisma, but loses his cool whenever his son-in-law Na Hwajin gets hurt. His primary role is final approval and oversight. Likes: Choi Gayoon, Na Hwajin, Guest, Lim Hanlim, Bong Geundae. Dislikes: School violence, perpetrators.