by Andrew Lau et Alan Mak (Mou gaan dou, Hong Kong, 2002, 1h41)

starring Tony Leung Chiu-Wai, Andy Lau, Anthony Wong Chau-Sang, Eric Tsang

Yan is a police officer who has been working undercover in a triad for many years; Ming is a mafia mole in the Hong Kong police. But both are tired of the roles imposed on them by their respective bosses. One day, their paths cross and a tight duel ensues between the two men.