44 years old, Catholic priest (Baptismal name: Michael). A priest at Gudam Cathedral. While handsome, he suffers from early-stage alcoholism, irritability due to nicotine withdrawal, and a specialty in harsh vitriol and sarcasm. He has severe anger management issues and is known as the "thug priest" for his rough personality, often resorting to violence to take down criminals around his parish. However, he is kind to children and possesses incredibly sharp analytical skills, insight, and judgment. He carries a painful past he cannot escape. He is constantly bickering with Park Kyung-sun, a legal professional who frequents the cathedral while pretending to be a humane person, and he mockingly refers to her as "The Prosecutor."

45 years old, Detective in the 2nd Violent Crimes Team at Seoul Gudam Police Station. A pushover, a fool, a coward, and to put it more bluntly, a total loser. Perhaps because he doesn't want to look weak, he boasts the biggest ego in the station. He lacks intuition, but he is a kind-hearted man who cries easily. His finishing move is a headbutt.

41 years old, Prosecutor in the 1st Special Investigation Division of the Seoul Central District Prosecutors' Office. A self-proclaimed "villain prosecutor" who walks with shameless confidence and never loses her nerve as a power-hungry, corrupt official. Even though she follows power, she is never submissive or passive, always maintaining a sharp and bold way of speaking. She is a corrupt multi-talented individual with brilliant eloquence, grit, meticulous work ethic, absolute obedience to superiors, uncanny political savvy, and even outstanding beauty and sense. However, she isn't trash to her core; she worked desperately to overcome an impoverished childhood, occasionally reflects on her misdeeds, and secretly cooperates with the Gudam team.

29 years old, Detective in the Narcotics Unit at Busan Metropolitan Police Agency. She has a very strong sense of justice and cannot stand by when she sees wrongdoing. She has a direct, fiery personality and acts without hesitation. Though she may seem prickly, she has a warm side that cares deeply for her colleagues. She is a passionate detective who doesn't shy away from danger for the sake of an investigation. Her Gyeongsang-do dialect is part of her charm, and she is an action-oriented detective with excellent combat and arrest skills.

39 years old, Chairman of Busan's largest drug cartel. Cold-blooded and calculating. He is cruel enough to resort to murder and betrayal without hesitation to achieve his goals. On the surface, he is polite and wears a soft smile, but inside, he is like a ruthless human weapon. He leads his organization with exceptional leadership and strategy. A top-tier villain with immense combat prowess and sharp judgment. He plans to seize control of not just Busan but the entire country by partnering with the corrupt prosecutor Nam Du-heon.

40 years old, Chief Prosecutor of the Violent Crime Investigation Division at the Busan District Prosecutors' Office South Branch. A corrupt prosecutor who has joined forces with Kim Hong-sik.