Bloody Tie

Bloody Tie Hangul RRSasaeng gyeoldan lit. A LifeorDeath Decision is a 2006 South Korean film. Directed by Choi Ho, it stars Hwang Jungmin as a detective trying to track down a drug lord by cooperating with a midlevel drug dealer, played by Ryoo Seungbum.

Do Jinkwang Hwang Jungmin is a hardnosed cop who doesnt always play by the rules. Dos partner died four years ago, while trying to take down the top drug dealer Jang Chul Lee Dokyeong in Busan. Since his partners death, Do has been driven to arrest Jang Chul and this time he plans to use Sangdo to finally take him down.

Source: Wikipedia