Male Nationality: Republic of Korea Birth Year: 1957 (69 years old in the story) Family: (Late) Choi Gayoon (Daughter) / Na Hwajin (Son-in-law) Affiliation: Ministry of Education (Minister) / Teachers' Rights Protection Agency (Director) / Happy Hope Party (Member of National Assembly) He has a relatively dignified personality. Of course, he also shows a side of himself that nags or acts petty toward Na Hwajin.

Male Nationality: Republic of Korea Birth Date: March 13, 1991 (35 years old) Family: (Late) Choi Gayoon (Fiancée) / Choi Kangseok (Father-in-law) Fighting Style: Krav Maga Affiliation: Teachers' Rights Protection Agency (TRPA) Position: TRPA Supervisor (Team Leader) Military Service: Discharged as Captain, Special Mission Battalion, Republic of Korea Army Special Warfare Command He throws jokes slyly and always maintains a fox-like composure. He is the strongest character in the series' universe. His proficiency in knife fighting is at the highest level, equal to his bare-handed combat. Unlike the unrefined Lim Hanlim, he was an elite officer from the Military Academy and possesses a fair amount of knowledge. He is also exceptionally skilled at intelligently and calmly controlling his anger even in infuriating situations. He does care for his juniors Lim Hanlim, Bong Geundae, Ku Sera, and Hyun Daniel.

Female Nationality: Republic of Korea Birth Year: 1998 (27 years old) Fighting Style: Jeet Kune Do Affiliation: Teachers' Rights Protection Agency (TRPA) Position: TRPA Supervisor Military Service: Discharged as Sergeant, Special Mission Battalion, Republic of Korea Army Special Warfare Command She is eccentric and prone to sudden outbursts. Her military background is prominent, as she uses formal military speech and the tone of a drill instructor. When she first met Bong Geundae, she squeezed his hand during a handshake to the point of nearly crushing it, calling it a 'battle of nerves.' During a mission, she got distracted by a tteokbokki truck near a school and bought food instead of working, which led to Bong Geundae getting kidnapped. Na Hwajin goes as far as to openly call her a 'psycho.' When she gets angry, she writes the character for 'patience' (忍) on her palm. She says, 'Three marks of patience can even prevent a murder.' There is a romantic connection with Bong Geundae, but neither realizes they like each other. 'You shouldn't kill anyone.' -Na Hwajin- 'Don't make me write the character for patience.' -Lim Hanlim herself- Bong Geundae: I mean, even if they're just kids, it's 4 against 1. Aren't you worried? Na Hwajin: Yeah, I'm worried. For those four. She doesn't seem to treat her juniors Ku Sera and Hyun Daniel... that well. When she gets truly angry, she ties her hair back into a single ponytail.

Male Nationality: Republic of Korea Birth Date: February 15, 2000 (26 years old) Affiliation: Teachers' Rights Protection Agency (TRPA) Position: TRPA Administrative Officer Education: Science High School (Graduated) / KAIST College of Engineering, School of Computing (Early Graduation) A genius administrative officer at the TRPA who graduated from KAIST early in just two years. He first appears in Episode 2, showing off his perfect 'loser' act to the point of having protection money ready. However, it was revealed that this was actually a disguise to stall for time for the TRPA. Na Hwajin calls him 'Bong-sa' (Officer Bong) for short. He is mentally fragile. There is a romantic connection with Lim Hanlim, but neither realizes they like each other. He is meeting Ku Sera and Hyun Daniel for the first time.

Female Nationality: Republic of Korea Birth Year: 2004 (22 years old) Affiliation: Teachers' Rights Protection Agency (TRPA) Position: TRPA Supervisor Education: Gangsan High School (One of the top 3 worst schools in the country; she was the top fighter there, which means her strength is incredible) Fighting Style: Strength, Ssireum (Her father was a former Ssireum wrestler), Grappling During her interview, she quoted her father saying that only those who have eaten meat know the taste, implying she understands the psychology of delinquents perfectly because she was one. Seeing how she immediately asked who she should beat up after finishing her introduction, she appears to be a combat-oriented supervisor like Lim Hanlim. She considers Hyun Daniel her rival, but Hyun Daniel doesn't care. She distinguishes between perpetrators and victims just by looking at their faces, a so-called 'Physiognomy Scouter.' She won an arm-wrestling match against Lim Hanlim. She is the youngest member of the TRPA. She is meeting Bong Geundae for the first time.

Male Nationality: Manhattan, New York (USA) / Republic of Korea (Dual Citizenship) Birth Year: 2000 (25 years old) Affiliation: Teachers' Rights Protection Agency (TRPA) Position: TRPA Supervisor Fighting Style: Self-defense (He claims to be a non-violent person, but Ku Sera calls him a 'NON-violent' person in a sarcastic way) His code name is Young Noble. He calmly blocks a punch thrown by Ku Sera, who was angry at people from other departments for looking down on him for being a high school graduate. Although he doesn't fight because he is 'non-violent,' he easily blocked the punch of a major perpetrator who claimed to have never lost in strength with one hand. He also lightly blocked Ku Sera's fast punch with one hand without a change in expression. Seeing how he instantly subdued the seniors called by a perpetrator trying to retaliate against Ku Sera by grabbing them by the scruff of their necks, he clearly possesses the skills to protect himself. He is meeting Bong Geundae for the first time.