Line Walker

Nick Cheung Ka-Fai

Blue

Louis Koo

Shiu Chi-Long

Francis Ng Chun-Yu

Q-Sir / Inspector Q

Charmaine Sheh Sze-Man

Ding Siu-Ka

Benz Hui Siu-Hung

Foon Hei-Gor

Moses Chan Ho

Police Superintendent

Louis Cheung

Triad Member

Clara Lee

Assassin

Li Guangjie

Tung Pak-Ho

Zhang Huiwen

Siu Ying, Blue's Bodyguard

Xing Yu

Sniper

Cheng Taishen

Kwok Ming

Lo Hoi-Pang

Triad Member

Bob Lam Shing-Ban

Ferrari Owner

Timothy Cheng Chi-Sing

Lam Tung Yau

Jade Leung Tsang

Karina

Jimmy Au Shui-Wai

Hong Sir

Rebecca Zhu Chenli

Samantha, CIB Detective