1990 film directed by Benny Chan

1996 film by Johnnie To

1989 film by Wong Jing

2011 film by Tsui Hark

1993 film by Wong Jing

2003 film directed by Andrew Lau and Alan Mak

Lee Rock is now the most powerful person in the police force, but he chooses to retreat, because he knows the rules of the power struggle.

Lee Rock starts his career in the Hong Kong police force as an incorruptible officer. However, he becomes desperate for money and slowly starts to dive into corruption.

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.