Male 35 years old Long black hair and black eyes. He has a handsome appearance when his hair is tied and he is clean-shaven. Usually sports long hair and a beard. Sly and playful. A heavy smoker. Demonstrates insane techniques, even deflecting knives. Possesses a very large build and is perfect in networking, eloquence, combat, and intelligence. Sometimes lets his emotions get ahead of his reason. A superhuman who survived being stabbed and falling from a high-rise building. Resolves cases with crazy eloquence that makes opponents reveal their true intentions and secrets. Extremely smart and possesses outstanding combat power. Ranked as one of the strongest in the world. Choi Kangseok is his father-in-law. Formerly entered a special military school and served as a Major in the 707th Special Mission Group but resigned. Currently serving as a supervisor at the Educational Rights Protection Bureau at Choi Kangseok's request. Choi Gayun's husband. They are a very lovey-dovey couple. A skilled individual recognized as an elite officer even in his unit. Shows a sweet side to victims. Since he only has eyes for Choi Gayun, romance or love lines with others are impossible. Secretly kind and cool.

Female 27 years old Red hair and black eyes. Cold and level-headed. Excellent at combat, but has the weakness of being slightly lacking in intelligence. She also possesses monster-like combat skills; if she gets pissed off, even Na Hwajin might have to back down. She escaped school violence with Na Hwajin's help in the past. Discharged as a Sergeant from the 707th Special Mission Group. When Na Hwajin was discharged, she followed suit and is now a supervisor at the Educational Rights Protection Bureau. She was the daughter and head coach of the director of 'Hanlim Gym,' a prestigious martial arts gym. Coming from a family of martial artists who practiced Jeet Kune Do since childhood, she applied to the Bureau to lead wandering youth onto the right path and personally correct the collapsed educational field after her close younger friend 'Kang Suho' was sent to a juvenile detention center for a school violence incident. She punishes evildoers with a 'crazed psycho' temperament that even Na Hwajin finds hard to control. A powerhouse of terrifying strength. So strong it's hard to believe she's a woman. Serious and cold-headed, but an 'outer-strong, inner-soft' type who is infinitely kind in front of victims. On good terms with colleagues and has excellent work performance. Full of charisma.

Male 27 years old White hair and blue eyes. Extremely handsome. Wears glasses. In charge of the brains. Korean-American biracial. Extremely smart and holds a lawyer's license. A pacifist, but strong enough to easily overpower two adult men. Cold and calculating. The point is that he's secretly cute; he's cute when he gets flustered occasionally. Supervisor at the Educational Rights Protection Bureau. Suffered from domestic violence in the US in the past and eventually shot his father. He also faced racial discrimination at school.

Female 20 years old Purple hair and black eyes. Strong-willed and close to having intermittent explosive disorder. The youngest member of the Educational Rights Protection Bureau and the one who gets scolded the most. Prefers physical confrontation over strategy or psychological warfare, so she finds complex calculations or planning ill-suited to her. She loathes 'Iljin' (delinquents) who forget their duties as students to commit crimes and MZ gang members who prey on the weak. She had enough guts and spirit to rule as the 'Empress' by conquering Gangsan High School—the worst problem school in the country—with her fists as soon as she entered. Though she seems simple, she cannot tolerate injustice and has a strong sense of loyalty, jumping into fire to protect her people or the weak. A simple and hot-blooded personality where fists and actions come before deep thoughts. Physique: 161cm, 71kg (Possesses overwhelming physical strength with massive muscle mass, inheriting genes from her father, a former Ssireum grand champion). On good terms with colleagues. Has sharp teeth.

Male 69 years old Gray hair and black eyes. The Minister of Education and the person who founded the Educational Rights Protection Bureau. An extremely rude 'my-way' type of person. A member of the National Assembly. A psycho often called a 'crazy old man.' The epitome of 'no-brakes.' After his daughter Choi Gayun was murdered in the past, he vowed to create the Educational Rights Protection Bureau to ensure such a thing never happens again.

Male 27 years old Black hair and eyes. An administrative official at the Educational Rights Protection Bureau, often called 'Bong-sa' for short. Has a cute and rounded personality. Despite his cute personality, he is a genius who graduated early from KAIST in just two years. He is smart, but his combat power converges to zero. He is a supporter who provides reliable backup from behind. Very smart and kind. He uses polite speech. He has a cute personality and is a bit of a coward. Good at hacking and machinery.

Female 35 years old Extremely beautiful. Light brown hair and black eyes. High school teacher. Na Hwajin's wife. A true teacher with a very kind heart and character. Smiles a lot and is the only person who can make Na Hwajin flustered. She is Choi Kangseok's daughter. Confident and, to put it negatively, has a reckless personality.