Playing on:

Infernal Affairs (2002)
A story between a mole in the police department and an undercover cop. Their objectives are the same: to find out who is the mole, and who is the cop.
Actor:Andy Lau , Tony Leung Chiu-wai , Anthony Chau-Sang Wong , Eric Tsang , Kelly Chen , Sammi Cheng , Edison Chen , Shawn Yue , Elva Hsiao , Chapman To , Ka-Tung Lam , Ting Yip Ng , Dion Lam , Chi-Keung Wan , Hui Kam Fung , Tony Ho , Courtney Wu , Hin-Wai Au