http://www.hkmdb.com/db/movies/view.mhtml?id=10638&complete_credits=1&display_set=eng

Characters names:
Daniel Wu (Lai Fu)
Cecilia Cheung (Dan Dan)
Alex Fong (Officer Milo)
Chin Kar Lok (Brandon)
Leung Chun Yat (Ben) [actor's christian name should be Anson]
Lam Suet (Liu)
Sam Lee (Franky)

Should add also:

Cast:
Monica Chan Faat Yung
陳法蓉
Cha Chuen Yee
查傳誼
Austin Wai Tin-Chi
惠天賜

Editor:
Cheung Ka-Fai
張嘉輝

Composer:
Peter Kam Pau-Tat
金培達

Art Director:
Horace Ma Gwong Wing
馬光榮

Martial Arts Director:
Chin Kar Lok

Dvd back cover cast & credits:

Added all of them, including prod.companies, photo., presenters and costume designers.

I do not find Monica Chan in the photo, so I added her in the last place.