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.
Wai Sai-Lok (Happy)
Heung Wing (Gordon)
Poon Hok-Lai (Brian)
Ko Hei-Suen (Sandy)
Chan Ka-Pik (Pat)
Madam Yu (Helen)
Ho Kwai
Cheng Chi-Seng
Nin Yau-Fu
Ng Dak-Tim