A determined detective continues his search for the truth behind Asia's largest drug organization and its elusive boss he has unfinished business with.

Detective Won-ho risks everything to apprehend the leader of a vast drug cartel, known as 'Mr. Lee,' and in so doing, becomes entangled in a complex relationship with two of the organization's prominent figures, Brian and Rak. Meanwhile, a formidable and brutal figure named Big Knife emerges within their midst.