Black City is controlled by two mafia organizations, “Sword" and “Discipline.” While on a scrap metal delivery, Jaewoo, a young man raising his younger brother alone, meets the boss of “Sword,” Risky. This man is the most notorious and dangerous gangster in the city. But after seeing an unexpected warmth in Risky, Jaewoo starts falling for him… But he should have never let his guard down. After getting brutally betrayed, Jaewoo is left with no choice. He must get his revenge, even if it means risking it all along the way.