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Infernal Affairs (2002)
- AKA: Mou gaan dou, 无间道, 無間道
- Country: Hong Kong
- IMDB Rating: 8.1
- Genres: Crime, Drama, Mystery
- Release: 2002-12-12 (Hong kong), 2003-09-05 (China), 2016-03-17 (South Korea)
- Director: Wai-Keung Lau , Alan Mak
- Writers: Alan Mak , Felix Chong
- Language: Cantonese | English | Thai
- Stars: Andy Lau , Tony Chiu-Wai Leung , Anthony Chau-Sang Wong , Eric Tsang
- Runtime: 101 min
- Awards: 23 wins & 24 nominations.
- Plot: Chan Wing Yan, a young police officer, has been sent undercover as a mole in the local mafia. Lau Kin Ming, a young mafia member, infiltrates the police force. Years later, their older counterparts, Chen Wing Yan and Inspector Lau Kin Ming, respectively, race against time to expose the mole within their midst.