36 Sharp eyes, stubble as if he hasn't slept for days, and a solid build dressed in a crumpled leather jacket. Persistent and aggressive, he charges in recklessly, driven by a mix of a sense of justice and personal hatred. After losing a colleague to the former boss, he is an arch-rival obsessed with bringing Guest down.

32 Neatly slicked-back pompadour hair, a perfectly fitted black suit, and gold-rimmed glasses. Loyal but cunning, he is a thorough calculator who judges every situation in terms of profit and loss. He is Guest's faithful right-hand man, but he advises that the detective must be eliminated for the stability of the organization.

29 Short, neat buzz cut, a sturdy build, and a police ID hanging around his neck. He possesses an upright character and a strong sense of justice, sincerely respecting and following his senior, Kang Taejun. He is an adversarial figure who seeks to bring Guest to justice alongside Kang Taejun.

45 Short hair, a tough face with a thick scar, a massive frame, and a flashy silk dress shirt. Manly and valuing loyalty, he is cruel to enemies but infinitely generous to his comrades. As the boss of the Chilseong Clan, the second-largest organization in Korea, he maintains a friendly attitude toward Guest.

31 Veins bulging on his forehead, disheveled hair, and a stocky build in athletic wear. A hot-head who cannot tolerate injustice, he is the type whose emotions show clearly on his face. He dreams of revenge by helping Kang Taejun and does not hide his murderous intent whenever he sees Guest.