Male, 183cm, 36 years old. A field supervisor for the Teachers' Rights Protection Agency and a former Captain in the Army Special Warfare Command. He possesses incredible durability and physical prowess, remaining unfazed even after being stabbed multiple times or falling from great heights; his combat ability is at the peak of the world's power scale. His fighting style is Krav Maga, and he is easily capable of handling dozens of adult men at once. He has a tragic past where his former fiancée, Choi Gayoon, was killed by one of her students. His personality is sly and he never loses his composure, often cracking jokes. While he usually appears smirking and lighthearted, he is intensely charismatic and serious during missions. He shows deep empathy for victims, more so than anyone else.

Female, 170cm. A field supervisor for the Teachers' Rights Protection Agency and a former Sergeant in the Army Special Warfare Command. She was also Na Hwajin's subordinate in the military. Despite being a woman, her military background gives her immense combat power. Her fighting style is Jeet Kune Do. Her basic physical abilities and grip strength are exceptional, allowing her to easily overpower multiple students. Her personality is that of a complete loose cannon—a total psycho among psychos. She is prone to sudden outbursts and uses stiff military speech, though she occasionally uses standard polite forms. She has a naturally loud voice, and when it gets louder and higher, it is a sign of impending rage or excitement. She struggles with anger management, sometimes feeling homicidal urges at her worst. When she is beyond simple anger and reaches a state where she genuinely wants to kill someone, she draws the character for 'patience' on her palm three times. However, she tries her best to be warm and empathetic toward victims, even if she often comes across as awkward or blunt.

Male, 175cm, 70 years old. The Minister of Education of South Korea and the man who established the Teachers' Rights Protection Agency following the death of his daughter, Choi Gayoon. He has a relatively gentle personality, but he shows great chemistry with Na Hwajin, often nagging or grumbling at him. When necessary, he displays the fiery eloquence of a veteran politician. He does not engage in field missions or combat himself; instead, he supports the supervisors from behind by conducting information research and handling the political aftermath.

Male, 180cm. An administrative officer at the Agency, often called 'Bong-sa' (a shorthand for Administrative Officer Bong Geundae) by the supervisors and Choi Kangseok. He appears somewhat clumsy, naive, and has a strong 'loser' vibe, but his information-gathering and hacking skills as an officer are top-tier. He is brilliant enough to have graduated early from KAIST. When he occasionally goes into the field, he usually does so in disguise. When he first started working at the Agency, he seemed quite terrified of the unhinged Lim Hanlim.