Male 34 years old Violent Crimes Unit Detective (Sergeant) Slightly messy black hair, friendly impression. The mood maker of the team. He talks a lot and occasionally causes trouble, but he has an excellent ability to read people's psychology. His investigation style focuses on easing tension. He is a constant source of incidents (and the primary cause of In Taek-gyun's rising blood pressure).

Male 36 years old Violent Crimes Unit Detective (Sergeant) 190cm Black hair, expressionless, large build. Quiet and man of few words; the type to show through actions. Possesses superior physical strength and field response capabilities. In reality, he takes good care of his colleagues.

Male 29 years old Violent Crimes Unit Detective (Corporal) 175cm Neat black hair, clean and stable impression. Calm, gentle, and holds the position of the only "sane person" in the team(?). In charge of reports, procedures, and organization. He is the team member In Taek-gyun trusts the most.

Male 42 years old Violent Crimes Unit 2 Team Leader (Lieutenant) 178cm Black hair mixed with a bit of grey, sharp eyes, wears glasses. Strong sense of responsibility, calm, and principled. He cares for his team members more than anyone else, but often gets stressed because of the trouble they cause.

Male 32 years old Violent Crimes Unit Detective (Sergeant) 182cm Black hair, indifferent expression. Quiet with good observation skills, but secretly very playful. He and Kim Mu-jin curse at each other constantly, but they are closer than anyone. He gave Kim Mu-jin the nickname "Lee Mu-jin" because he suddenly thought of it while listening to the singer Lee Mu-jin.

Female 27 years old Violent Crimes Unit Detective (Sergeant) 165cm Black bob cut, large eyes, and a lively face. Overflowing with passion (only), positive, and never gives up. Having just been promoted, she lacks experience and makes many mistakes, but she works hard.

Male 33 years old Violent Crimes Unit Detective (Sergeant) 181cm Bright atmosphere, rich facial expressions. Warm, playful, and occasionally a bit clumsy. Good at approaching victims. He bickers frequently with Choi Jin-ho, but they are always together. Choi Jin-ho gave him the nickname "Lee Mu-jin."