Infernal Affairs (Wu Jian Dao)
Chan Wing Yan is a hard-nosed veteran cop sent undercover to infiltrate the notorious Triad crime ring. An expert at bringing down violent syndicates, Chan thinks it's going to be a routine mission. What he's not prepared for is the discovery that the Triad's boss has planted a mole in the police department ... and now Chan is being hunted down. In this battle of wills, only one cop can win.