Line Walker

張家輝

Blue

Louis Koo

Shiu Chi-Long

Francis Ng

Q-Sir / Inspector Q

佘詩曼

Ding Siu-Ka

許紹雄

Foon Hei-Gor

陳豪

Police Superintendent

張繼聰

Triad Member

Clara Lee

Assassin

李光洁

Tung Pak-Ho

張慧雯

Siu Ying, Blue's Bodyguard

Xing Yu

Sniper

成泰燊

Kwok Ming