Veteran cop Chan Wing Yan (Tony Leung) goes undercover to expose the detective who's been leaking information to the criminal underworld; but the high-ranking mole (Andy Lau), whose identity Chan has yet to reveal, also has no idea who the internal investigator is. The men find themselves locked in a dangerous game of cat and mouse in this crime thriller that inspired director Martin Scorsese's Oscar-winning English-language remake, The Departed.

Drama, Foreign, Thriller

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