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.
| Tagline: | Loyalty. Honor. Betrayal. |
| Cast: | Andy Lau, Anthony Wong, Berg Ng Ting-Yip, Chapman To, Dion Lam, Edison Chen, Elva Hsiao, Eric Tsang, Gordon Lam Ka-Tung, Kelly Chen, Sammi Cheng, Shawn Yue, Tony Ho Wah-Chiu, Tony Leung Chiu-Wai, Wan Chi-Keung |
| Director: | Alan Mak, Andrew Lau |
| Country: | Hong Kong |
| Release: | |
| Language: | 广州话 / 廣州話 |
| Revenue: | $ 8.708.932,00 |
