After working as an undercover in a triad for 8 years, Sheng finally arrests the triad leader and resumes his duties as a police officer. However, life does not return to normal as he is faced with suspicions colleagues and even trailed by the investigations team. One day, he meets some triad members whom he has earlier befriended as an undercover agent and is forced into a corner when asked to collaborate with them once again.
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Nick Cheung Ka-Fai
Harry Sin
Francis Ng Chun-Yu
Don Dark
Anthony Wong Chau-Sang
Lung
Rain Lee Choi-Wah
Cat
Derek Tsang Kwok-Cheung
Mini B
Calvin Poon Yuen-Leung
Jimmy
Lester Chan Chit-Man
Mr. Cheung (as Lester Chan)
Chik King-Man
Amy
Pauline Yam Bo-Lam
Madam Ho
Raymond Tsang Chau-Ming
Sam
Ming-Sing Wong
Dave
Y.Y. Lam
Kitty, Dave's Girlfriend
Wong Ting Pong
Internal Investigations Office Constable
Sze-Ming Lu
Tsu
Frankie Chan Chi-Leung
Hon
