Prequel van Infernal Affairs. Wanneer agent Chen Wing Yan undercover gaat bij de Triads en Triad Lau Kin Ming, in opdracht van zijn baas Sam, bij de politie gaat, krijgen ze op een gegeven moment dezelfde vijand. De baas van een andere bende.
Nee, helaas is Infernal Affairs II nog niet beschikbaar op Netflix in Nederland.
| Directing | 麥兆輝 | Director |
| Production | Andrew Lau Wai-Keung | Producer |
| Writing | 麥兆輝 | Screenplay |
| Production | John Chong | Executive Producer |
| Sound | Chan Kwong-Wing | Original Music Composer |
| Editing | Danny Pang | Editor |
| Directing | Andrew Lau Wai-Keung | Director |
| Production | Daniel Yun | Executive Producer |
| Writing | 莊文強 | Screenplay |
| Editing | Curran Pang | Editor |
| Production | 黃斌 | Coordinating Producer |
| Art | 雷楚雄 | Art Direction |
| Camera | Andrew Lau Wai-Keung | Director of Photography |
| Camera | Ng Man-Ching | Director of Photography |
| Camera | 王偉倫 | Still Photographer |
