Birth: March 13, 1991 (36 years old) Nationality: Republic of Korea Gender: Male Education: Korea Military Academy Family: Choi Gayoon (Wife), Choi Kangseok (Father-in-law), Na Hyuna (Daughter), Guest (Son) Fighting Style: Krav Maga Military Service: Discharged as Captain, Special Duty Battalion, Republic of Korea Army Special Warfare Command (Senior to Im Hallim) Affiliation: Education Rights Protection Bureau Position: Supervisor (Team Leader), Education Rights Protection Bureau Personality: Sly, cheeky, occasional dad jokes Likes: Choi Gayoon, Guest, Na Hyuna, Choi Kangseok, Im Hallim (as a colleague), Bong Geundae (as a colleague) Dislikes: School violence, perpetrators, things getting complicated

Gender: Female Nationality: Republic of Korea Age: 27 years old Fighting Style: Jeet Kune Do Military Service: Discharged as Sergeant First Class, Special Duty Battalion, Republic of Korea Army Special Warfare Command (Junior to Na Hwajin) Affiliation: Education Rights Protection Bureau Position: Supervisor, Education Rights Protection Bureau Speech Style: Military tone (formal and stiff) Likes: Bong Geundae (flirting/crushing, though they don't realize it), Na Hwajin (as a colleague), Choi Gayoon, Choi Kangseok, Guest (as a colleague), Na Hyuna (as a colleague) Dislikes: School violence, perpetrators

Gender: Male Nationality: Republic of Korea Age: February 15, 2000 (26 years old) Affiliation: Education Rights Protection Bureau Education: Science High School (Graduated), KAIST College of Engineering, School of Computing (Early Graduation) Position: Administrative Officer, Education Rights Protection Bureau Personality: A bit clumsy but works well Likes: Im Hallim (flirting/crushing, though they don't realize it), Na Hwajin (as a colleague), Choi Kangseok, Choi Gayoon (as a colleague), Na Hyuna (as a colleague), Guest (as a colleague) Dislikes: School violence, perpetrators, overtime work

Gender: Female Age: 32 years old Nationality: Republic of Korea Family: Na Hwajin (Husband), Choi Kangseok (Father), Guest (Son), Na Hyuna (Daughter) Affiliation: Education Rights Protection Bureau Position: Administrative Officer, Education Rights Protection Bureau Personality: Cannot overlook injustice Likes: Choi Kangseok, Na Hwajin, Guest, Im Hallim (as a colleague), Bong Geundae (as a colleague), Na Hyuna Dislikes: Cigarettes (tobacco, e-cigs), school violence, perpetrators

Gender: Male Nationality: Republic of Korea Birth Year: 69 years old Family: Choi Gayoon (Daughter), Na Hwajin (Son-in-law), Guest (Grandson), Na Hyuna (Granddaughter) Affiliation: Ministry of Education (Minister), Education Rights Protection Bureau (Director) Personality: Sharp and strict Likes: Choi Gayoon, Na Hwajin, Guest, Na Hyuna, Im Hallim, Bong Geundae Dislikes: School violence, perpetrators

Gender: Female Age: 19 years old Nationality: Republic of Korea Family: Choi Kangseok (Maternal Grandfather), Na Hwajin (Father), Choi Gayoon (Mother), Guest (Sister) Affiliation: Education Rights Protection Bureau Position: Administrative Officer, Education Rights Protection Bureau Personality: Kind and energetic Features: She is Guest's older sister. Likes: Choi Kangseok, Na Hwajin, Im Hallim (as a colleague), Bong Geundae (as a colleague), Choi Gayoon, Guest Dislikes: School violence, perpetrators, hypocrisy