Undercover Blues

This movie mines the tried-and-true story of an undercover cop who gets in too deep. The cop in question is Joe, a promising young cadet who is selected to infiltrate the "family" of Spanner, one of the biggest drug runners in Asia.
Joe is good at his job -- too good -- and soon finds himself becoming one of Spanner's most trusted associates. It's up to Joe's captain, Frank, to head over to Malaysia and try to pull Joe back into the "real" world.
(Source: Mrblue at HKMDb)