"Kangryeok" concerns the men of Homicide Unit 3, who are in dire straits at the moment. While Unit 3's cops are full of ambition and talent, they never seem to crack a case. The team is comprised of Detective Koh, a 15 year veteran, Detective Kim (Min-jun Kim), a rookie eager to make a name for himself, Detective Koh, a married man who spends more time on the job than with his wife, and Detective Ryung ( Sang-mi Nam ), who can't get taken seriously by her peers because she's a woman. While at a party with his girlfriend, Kim happens upon information about a drug deal that could get the team the respect they've been looking for. But what the team gets into turns out to be not just a big drug bust, but a case that makes Homicide Unit 3 the target of the largest drug lord in Korea .