All three films in the Hong Kong gangster epic trilogy. In 'Infernal Affairs' 2002, the cops and the Triads have something in common each has a mole in their midst. Ming Andrew Lau and Yan Tony Leung have been leading parallel lives Ming is a Triad mole who has infiltrated the police department, and Yan is an undercover cop who has, over the years, risen to a position of authority in the Triad gang. Both are dissatisfied with their position, wishing they could put their false lives behind them. Then one night the two men's paths finally cross during a police raid. Both the police and the Triads realise they have informers amongst them, and the race begins for Ming and Yan to get out alive. 'Infernal Affairs 2' 2003 is a prequel, set ten years before the events of the original film. Chen Ying Yan Shawn Yue has just become an undercover cop in the triads, while Lau Kin Ming Edison Chen is a new recruit to the police force. Bitter enemies in the first film, Inspector Wong Anthony Wong Cha