- HD 1080
- Runtime: 100m.
- Status: Released
1
- Languages: cn
- Country: Hong Kong
- Director: Alan Mak, Andrew Lau Wai-Keung
- Stars: Andy Lau Tak-Wah, Tony Leung Chiu-Wai, Anthony Wong Chau-Sang, Eric Tsang Chi-Wai, Kelly Chen
- keywords: undercover agent, undercover, hong kong
- Production_studio: Media Asia, Basic Pictures
- Slogan: Loyalty. Honor. Betrayal.
- providers: Max, Max Amazon Channel, Criterion Channel
- The Infernal Affairs is featured in the top rankings of 2002
- #9 in Top Drama Movies of 2002
- #3 in Top Action Movies of 2002
- #4 in Top Crime Movies of 2002
- #1 in Top Thriller Movies of 2002
- #1 in Top Mystery Movies of 2002
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.
