Lee Minwoo is the Senior Inspector of Criminal Intelligence Bureau (CIB) with only 21 days left to live. He must race against time to stop an illegal drug trade between a Thailand Drug Lord and Junjin, the ruthless leader of The Park triad. While trying to track the trade with assistance from his undercover subordinate Lee Sunho, Minwoo get's tangled in an unexpected one-night-stand with Kim Dongwan, the new leader of The Kim triad. In addition, Minwoo struggles to help his friend Mun Junghyuk (Eric), Senoir Inspector of Narcotics Bureau (NB), let go of his past and the person Junghyuk has lost - Jung Pilkyo. Junjin's hates the police, especially the former mole that destroyed his triad and cousin, and never trust love but then he meets Andy.