Zhang Jin as Kowloon

Kevin Cheng Ka-Wing as Tso Chi-tak

Annie Liu Xin-You as Kay Wong

Stephy Tang Lai-Yan as Fong Ning

Richard Ng Yiu-Hon as Wong Bing-cheong

JuJu Chan as Lam Tik-fong

Anderson Silva as Alexander Sinclair

Endy Chow as Chow Mo

Hugo Ng as CSP Lai

Lam Suet as Uncle

Carl Ng as Panther

Vernon Fong as Yeung

Loletta Lee Lai-Chun as Jane

Steve Wong Ka-Keung as Coroner

Deon Cheung Chung-Chi as Cheung Fung-hap

Liu Chun-Hung as Chan San

Marsha Yuen Chi-Wai as Cheng Wing-yi

Olokigbe Israel Tunde as Admen Sinclair

Alan Wan as Keung

Yatho Wong Yat-Ho as Mou

Mingyu Chu as Po

Anjo Leung as Lemon

Hinson Chou as CID

Vivek Mahbubani as Charity Boxing Match Host

Dave Lam Ching as Underground Boxing Coach/Fighter

Lawrence Ah Mon as Bicycle Rider

Kedma Costa as Chopsticks

Ellen Costa as Chopsticks

Tina Cheng as News Reporter

Mike Lok Kei as Uncle's thug

Christian Chung Wai-Kit as Uncle's thug

Aki Lee as Uncle's thug

Chan Cheong-Fai as Uncle's thug

Yu Hon-Lam as Uncle's thug

Andy Wong Chi-Man as Uncle's thug

Carson Yau as Young Kowloon

Stephen Wong Kwok-Wah as PTU

Cheung Ho-Kit as Chief Superintendent of Police

Leung Chi Kwong as Senior Superintendent of Police

Lau Chi-Fat as Senior Superintendent of Police

Kwok Yuk-Keung as Senior Superintendent of Police

Faye Chui as Ng Ka-yin

Water Hung as Shui

Ho Ho-Fung as CSP Lai's Deputy

Kot Wai-Fong as Fong Ning's mother

Au Hin-Wai as Fong Ning's father

Man Fong as Doll

Hari Das Ahatefu as Mystery Killer

Law Ka-Chun as Underground Boxing Match Host

Shi Zhanjie as Underground Boxing Coach Assistant

Roger Chau as Charity Boxing Match Referee

David Yu Tat-Chi as Chow Mo's relative

Tsang Ah-Yee as Chow Mo's relative

Chloe Wong as Chow Mo's relative

Kwok Hoi-Tung as Chow Mo's relative

Lau Koon-Man as Chow Mo's relative

Nic Tsang Chun-Yuen as Chinese Pharmacy Staff