The Gangster, The Cop, The Devil -

As they close in, K realizes he is being hunted by both sides and begins to enjoy the challenge, intentionally leaving clues to bait his pursuers. The Climax

Jung Tae-suk is a hot-headed detective convinced that a string of recent "accidental" murders are the work of a single serial killer. His superiors ignore him, but he realizes Dong-soo is the only living witness to the murderer. The two men strike a deal: The Gangster, The Cop, The Devil

Dong-soo provides the manpower and underworld intel. Intel: Tae-suk provides police data and forensic tools. As they close in, K realizes he is

They find K’s weapon—a specific type of knife—and track his stolen vehicle. The two men strike a deal: Dong-soo provides

Jang Dong-soo, a powerful mob boss, is driving home alone on a rainy night. A stranger intentionally rear-ends his car. When Dong-soo steps out, the stranger—a nameless serial killer known as "K"—stabs him repeatedly. Dong-soo fights back with terrifying ferocity, wounding the killer before K escapes. Dong-soo survives, but his reputation as an untouchable kingpin is shattered. The Uneasy Alliance