On the first day of April 2004, a rumour emerges that Hong Kong's most influential triad organization is planning to assassinate the new Commissioner of Police, who will take charge in 30 days. Three unrelated policemen, Fung Chi Wai (Criminal Investigation Division), Wong Ka Fai (chief of Criminal Investigation Bureau) and undercover Yeung Kai Dong find themselves implicated.
Alex Fong Chung-Sun
Yoyo Mung Ka-Wai
Kevin Cheng Ka-Wing
Patrick Tam Yiu-Man
Marco Ngai Chun-Git
Mandy Lee Cho
Chris Lai
Claire Yiu
Fiona Yuen Choi-Wan
Kenny Wong Tak-Ban
Johnson Lee Sze-Chit
Sririta Jensen
Eddy Ko Hung
Lau Kong
Ken Lok Tat-Wah
Mark Kwok
Chatchai Plengpanich
Lee Shing-Cheong
Jerry Koo Ming-Wah
Steve Lee Ka-Ting
Chan Dik-Hak
Benz Hui Siu-Hung
Lee Tin-Cheung
Miki Yeung Oi-Gan
Cho Chun