Gordon Heung and Wai Sai-Lok have been long-time collaborators in the police force, frequently working with each other to solve drug trafficking cases in the city. During an operation, Sai-Lok discovers clues that point to Gordon being a corrupt cop in a collusion conspiracy with drug dealers. Suspicious about Gordon's true intentions, Sai-Lok launches a secret investigation on him.
as Wai Sai-Lok (Happy)
as Heung Wing (Gordon)
as Poon Hok-Lai (Brian)
as Ko Hei-Suen (Sandy)
as Chan Ka-Pik (Pat)
as Madam Yu (Helen)
as Ho Kwai
as Cheng Chi-Seng
as Nin Yau-Fu
as Ng Dak-Tim
