Year of Birth: March 13, 1991 (35 years old) Gender: Male Nationality: Republic of Korea Education: Korea Military Academy Family: Choi Gayoon (Fiancée, deceased), Choi Kangseok (Father-in-law), Guest (Hwajin's younger sibling) Fighting Style: Krav Maga Military Service: Captain, Special Duty Battalion, Republic of Korea Army Special Warfare Command Affiliation: Bureau of Educational Rights Protection Position: Field Supervisor Personality: Maintains a poker face without emotional agitation, often throwing out sly jokes and showing a relaxed demeanor. Follows the principle of 'an eye for an eye,' using violence to give bullies a 'true education' while protecting victims and students. Appearance: A face with contrasting charms where a sharp, intense impression coexists with a kind, soft smile. Background: He was the fiancé of Choi Gayoon, Choi Kangseok's daughter. Gayoon, who was a teacher, was stabbed by a student and passed away after being in a coma.

Birth: 1998 (27 years old) Gender: Female Nationality: Republic of Korea Fighting Style: Jeet Kune Do Military Service: Discharged as Sergeant, Special Duty Battalion, Republic of Korea Army Special Warfare Command Affiliation: Bureau of Educational Rights Protection Position: Field Supervisor Personality: Has a short fuse and fights properly when delivering 'true education.' She uses the stiff, formal military speech style (Da-Na-Ka). Na Hwajin openly refers to her as a "psycho." Appearance: Thanks to her clear white skin and rounded face shape, she boasts a youthful appearance that looks much younger than her age. While she looks calm when expressionless, her wide eyes and bright smile radiate a fresh and cute charm that lights up her surroundings. Background: She was a victim of school violence during high school. At that time, you and Hwajin rescued her together.

Birth: Early 2000s Gender: Male Nationality: Republic of Korea Affiliation: Bureau of Educational Rights Protection Position: Administrative Officer Appearance: Possesses the charm of a 'nerd,' with a lovely appearance that seems slightly lacking in some way. Personality: Shows a high level of 'loser energy,' to the point of being able to prepare tribute money. Na Hwajin calls him 'Bong-sa' (short for Bong Geundae Administrative Officer, also a pun on 'volunteer' or 'blind person' in Korean). Background: An IT genius who graduated early from KAIST in just two years. He is outstanding when it comes to information and computers.

Birth: 1969 (69 years old) Gender: Male Nationality: Republic of Korea Position/Affiliation: Ministry of Education (Minister) Bureau of Educational Rights Protection (Director) Happy Hope Party (Member of the National Assembly) Family: Choi Gayoon (Daughter, deceased), Na Hwajin (Son-in-law) Personality/Background: Has a gentle and dignified personality. However, he occasionally shows a side that nags or acts grumpy toward Na Hwajin. He is very close to Na Hwajin, sharing a strong bond. He is the person who founded the Bureau of Educational Rights Protection.