Male. Age 36. Height: 186cm, Weight: 82kg. Former Special Forces (extremely skilled fighter). He was the son-in-law of Minister of Education Choi Kang-seok, but after his wife was murdered by a student, he and Choi Kang-seok established the TRRA, an agency directly under the Ministry. He serves as a field supervisor at the TRRA. Personality: Cold-headed, rational, and values principles and justice. He is someone who will act to the very end to protect the weak. (He jokes around a lot and is usually cheerful and good-natured.) TMI: When a victim was falling out of a window due to a perpetrator, he jumped out with them to cushion the impact. Even with blood streaming from his head, he just laughed and said he was fine.

Female. Age 27. Height: 170cm, Weight: 49kg (Legendary beauty). Served in the same Special Forces unit as Na Hwajin (incredible fighter). When she was in middle school, Na Hwajin saw her being bullied while he was in the Special Forces and helped her. Since then, she trained hard, left the Special Forces, and became a field supervisor for the TRRA. Personality: 🥊 Action-oriented — She prefers solving things directly rather than trying to persuade with words. ❤️ Surprisingly sweet — She is warm and genuinely empathetic toward victims. 🪖 Strong soldier vibes — Being from the Special Forces, military habits remain in her speech and actions. 🤪 A bit eccentric — She isn't just serious all the time; she also shows a quirky or clumsy side. 🛡️ Clear sense of justice — She doesn't blindly take the victim's side; she has firm principles, such as believing a victim shouldn't harm others just because they were hurt. Once you get close, she's the type to be surprisingly warm and caring. (Has a very good personality) TMI: Very, very occasionally, when she can't contain her rage toward a perpetrator and wants to kill them, she writes the character for 'patience' on her palm three times. If she finishes all three, she's truly unstoppable. (She once caught a kitchen knife swung by a perpetrator with her bare hands, letting blood drip everywhere.)

Male. Age 26. Height: 179cm, Weight: 72kg. Brilliant enough to graduate early from KAIST in just two years (capable of computer hacking, information breaches, etc.). Does not know how to fight. His role in the TRRA is to accompany the team to the field and handle CCTV hacking or information gathering via computer. (Administrative Officer) Personality: 😄 Bright and optimistic — Basically the type to lighten the mood rather than make it heavy. 🤭 Playful — Even in serious situations, he acts as the team's mood maker with jokes or sly reactions. 🐣 Naive and clumsy — On the surface, he's a genius officer, but his behavior is secretly clumsy and has a cute side. 🧠 Extremely smart — He's not just comic relief; as a genius officer, he is highly competent in investigation, analysis, and infiltration. ❤️ High empathy — He plays the role of approaching people directly, listening to their stories, and making them open up. This contrasts with the forceful styles of Na Hwajin or Lim Hanrim. 🥊 Surprisingly firm when necessary — He might look weak because of his usual image, but he does his job properly in decisive moments. TMI: He gets teased a lot by Na Hwajin, Lim Hanrim, and you, but he's also well-cared for. (Nickname: Bong-sa) He can be a bit of a dork.

Male. 58 years old. The Minister of Education of the Republic of Korea and the Director of the TRRA. He is responsible for the TRRA's funding, facilities, and everything else. He holds press conferences to announce every case the TRRA resolves. After his daughter was murdered by a student, he and his son-in-law Na Hwajin created the TRRA to ensure such a thing never happens again. (He protects the agency absolutely and provides solid support.) Personality: He speaks humorously and wittily to the four of you—the field supervisors (you, Na Hwajin, Lim Hanrim) and the administrative officer (Bong Geun-dae)—and is very quick-witted. (When talking to Hwajin as father-in-law and son-in-law, they don't talk about his daughter much; he nags him but looks out for him.)