The worst of evils

A member of the Gangnam Union and Gi-chul's partner, he is observant and rational, often calculating risks. Observant, cautious, and rational, he doesn't rush into a fight, but rather calculates the risks first. In the gang, he is the one who tries to keep everyone from self-destructing and often acts as the voice of common sense. His personality is all about control and strategy.

A gang member with a girlfriend and a young son, he shows how the criminal world intertwines with ordinary life. He tries to balance "ordinary life" with a criminal one: he has a family and wants his son to be proud of him. Because of this, he is constantly torn between the desire to "just survive" and the pressure of the gang. His character demonstrates how the criminal world breaks even those who don't want to be monsters.

A mid-level manager at the Gangnam Union, a professional assassin, especially dangerous with a knife; Gi-chul's right-hand man and "cleaner." Cruel, disciplined, and fiercely loyal to Gi-chul, he values ​​hierarchy and duty over morality: if the boss says "it must be done," he'll do it. He acts as a "cleaner" and doesn't reflect on it—his strength lies in his lack of doubt.

A Korean-Chinese drug distributor from Changchun, she collaborates with Jeong Ki-cheol. Her character adds an international flavor to the drug network. Bold and pragmatic, she operates by her own rules. She doesn't idealize the criminal world or seek romance in it—for her, it's business. At the same time, she knows how to read people and exploit their weaknesses, making her dangerous to play with. Her character is built on independence and cold calculation.

Park Joon-mo's wife, a drug enforcement officer. She has a complicated past: she was Jung Ki-chul's first love, dating back to high school, and this connection constantly influences the investigation. She's strong, collected, and professional, managing to keep her emotions under control, but her past with Ki-chul still affects her. She's both a support system for her husband and a source of tension: she has to balance duty, emotions, and the need to make tough decisions. Her character is characterized by a lot of suppressed pain and responsibility.

A police officer who goes undercover. To infiltrate the gang, he disguises himself as Kwon Seung-ho, the cousin of the gang leader's deceased best friend. Within the group, he must balance duty, risk, and moral compromise. He is a man on the edge: he is an honest cop, but he agrees to a dangerous undercover operation partly out of ambition and a feeling of being underappreciated. Within the gang, he is forced to do things that contradict his principles, and the line between his "role" and "himself" gradually blurs. His character is a constant struggle between duty and who he becomes for the sake of the cause. He is deeply attached to his wife and fears losing her, which makes him vulnerable and at times impulsive.

The leader of the Gangnam Union crime group, responsible for the distribution of the drug "Gangnam Crystal." He started out as a DJ and eventually became a powerful crime boss. Charismatic, cold, and calculating, but not devoid of human emotion: he remembers the past, values ​​"his own people," and reacts painfully to betrayal. He's not just a "villain for the sake of evil": he builds his empire as a way to control the chaos around him and no longer be weak. His strength lies in his ability to maintain a level head and exert authority, and his weakness lies in his attachment to old connections (especially to Yoo Eui-jeong).