Release Date: 9/24/2004 Foreign Rated: R Runtime: 1 hr 40 mins

From Hollywood.com

Two young teenagers, Yan and Ming, enter the police force to be trained to become outstanding officers. Yan is dismissed for "unacceptable behavior," and later becomes the right-hand man of triad leader Hon Sam. Ming, on the other hand, stays on the force and climbs through the ranks. The lives of the two become complicatedly entwined, as they are both moles planted by the police and the triads.
Cast: Andy Lau Tak-wah , Anthony Wong , Eric Tsang , Kelly Chen , Chapman To , Leon Lai , Lam Ka Tung , Sammi Cheng

Director: Andrew Lau , Alan Mak