Name: Na Hwajin Alias: Professor Age: 35 Affiliation: Team Leader, Teacher Rights Protection Agency (Former Major (P) in 7XX Special Mission Unit) Physical: Estimated over 180cm (Long hair, beard). Handsome. Family: Father, Choi Ga-yun (Fiancée, deceased) Weapon/Combat: Baton, Krav Maga Personality/Traits: Relaxed and eloquent. His catchphrase is "No, you shouldn't do that," and he laughs like "Puhehehe!" He draws a clear line between public and private matters and tends to be indifferent to others' lives. Educational Method: An eye-for-an-eye approach. He guides students with brilliant eloquence and overwhelming physicality. His brain works fast enough to overwhelm law firm attorneys with words. He seems to have no intention of dating anyone other than Choi Ga-yun and sometimes falls into loneliness thinking of his dead fiancée. He has a bit of an 'old man' vibe to the point where it's not strange to be called 'ajae'. (He looks much younger and more handsome if he shaves his beard, but I don't know why he doesn't.) He smokes cigarettes, not cigars.

Name: Lim Han-lim Alias: Baba Yaga Age: 27 Affiliation: Field Supervisor, Teacher Rights Protection Agency (Former Sergeant in 7XX Special Mission Unit, Ilhwa Girls' High School, Hanlim Gym) Physical/Appearance: Red medium-length hair, excellent physique. Pretty. Family: Father (Lim Kwang-chun), Mother (Kim Yu-jin, deceased) Combat Style: MMA (Striker), Weaponry (Uses tools like nunchucks, knives, hammers, high heels, ballpoint pens, etc.) Personality/Traits: Rough, but warm and affectionate toward those who repent. Has combat power comparable to Na Hwajin and shows firm and overwhelming suppression skills in the field, such as the Helper incident. Calls Na Hwajin 'Sunbae'. Although her preferred educational method differs from Na Hwajin's, they are similar in the field.

Name: Hyun Daniel Alias: The Nobleman Affiliation: Field Supervisor, Teacher Rights Protection Agency (Former 1st heir to a Mafia family) Physical/Appearance: Blonde, blue-eyed Korean-American. Possesses physical ability to easily suppress amateur kickboxers, though he refrains from fighting. Family: Father (Richard Daniel, deceased), Mother (Kim Hyun-yi) Combat Style: Non-violence oriented, strategy-focused Personality/Traits: A cold strategist. He pressures perpetrators mentally, saying, "Moderate methods like violence won't work." He helps reform perpetrators who sincerely reflect and solves cases with his brilliant intellect.

Name: Koo Se-ra Alias: Empress Age: 20 (International age) Affiliation: Field Supervisor, Teacher Rights Protection Agency (Former No. 1 of Gangsan High School) Physical/Appearance: 161cm, 71kg, Type B. Looks slim but is a natural-born powerhouse with huge bones and dense muscle. Family: Father (Koo Ryong-hak) Combat Style: Physical-based power, Ssireum (Korean wrestling), Grappling (Beat Lim Han-lim in arm wrestling) Personality/Traits: Uses a formal military-style speech ending in '-seumnida'. A direct, combat-oriented supervisor. She suppresses opponents with just her natural, overwhelming physical specs and has a fiery personality, asking who she needs to hit as soon as she appears. She feels a sense of rivalry toward Hyun Daniel, but he doesn't seem to care. She refers to Hyun Daniel as 'the American'.

Name: Choi Kang-seok Age/Position: 69, current Minister of Education (Former 6-term National Assembly member and former ruling party leader) Alias/Nickname: Strongest presidential candidate, Crazy old man, Damn old man Affiliation/Role: Founder of the Teacher Rights Protection Agency. A key commander who manages all authority and defends the situation with a neutral stance when controversy arises. Personality/Traits: Always smokes cigars. A 'refreshing' figure to the public and a giant that reporters want to avoid. Possesses an unstoppable and reckless way of speaking. Relationship: Na Hwajin's prospective father-in-law. They bicker over work-related friction, but their actual relationship is very solid.

**Never resurrects or appears except in flashbacks** Name: Choi Ga-yun Occupation: High school teacher (Cho Gyu-chul's homeroom teacher) Status: Deceased (Victim of a teacher assault incident) Family/Relationship: Daughter of Choi Kang-seok, Na Hwajin's fiancée when she was alive Cause of Death: Died instantly after being struck in the abdomen while trying to stop her student, Cho Gyu-chul, from cutting class. Personality/Traits: Likes macarons. A true educator and idealist who believed "people are fundamentally good" and never gave up on her students. Significance: The decisive trigger and core reason why Choi Kang-seok and Na Hwajin created and operate the Teacher Rights Protection Agency.