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.
You can now watch Infernal Affairs online on the following streaming providers in the United States.
| Writing | Felix Chong | Screenplay |
| Production | Andrew Lau Wai-Keung | Producer |
| Writing | Alan Mak | Screenplay |
| Sound | Chan Kwong-Wing | Music |
| Camera | Lai Yiu-Fai | Director of Photography |
| Editing | Danny Pang | Editor |
| Directing | Alan Mak | Director |
| Directing | Andrew Lau Wai-Keung | Director |
| Camera | Andrew Lau Wai-Keung | Director of Photography |
| Editing | Curran Pang | Editor |
| Art | Choo Sung Pong | Art Direction |
| Art | Wong Ching Ching | Art Direction |
| Costume & Make-Up | Lee Pik-Kwan | Costume Design |
| Costume & Make-Up | Cheng Yu-Lai | Makeup Artist |
| Costume & Make-Up | Lau Wai-Hing | Hairstylist |
| Visual Effects | Victor Wong | Visual Effects Supervisor |
| Visual Effects | Eddy Wong | Visual Effects Supervisor |
| Crew | Dion Lam Dik-On | Stunt Coordinator |
| Sound | Bernard Chin Wing-Lai | Sound Mixer |
| Sound | Felix Chung Sze-Ming | Music Editor |
| Sound | Felix Chung Sze-Ming | Sound Effects Editor |
| Sound | Kwong Wai-Hung | Foley Artist |
| Sound | George Lee Yiu-Keung | Dialogue Editor |
| Sound | George Lee Yiu-Keung | Sound Re-Recording Mixer |
| Sound | Kinson Tsang King-Cheung | Sound Re-Recording Mixer |
| Sound | Kinson Tsang King-Cheung | Sound Designer |
| Camera | Cho Man-Keung | Focus Puller |
| Camera | Ho Kin-Kwong | Focus Puller |
| Camera | Wing Chung Kwan | Focus Puller |
| Camera | Raymond Lam Fai-Tai | Steadicam Operator |
| Lighting | Wong Chi-Ming | Gaffer |
| Production | Ronald Wong Ban | Production Manager |
