Max 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 Kwok-Yin as Chow Mo

Hugo Ng Doi-Yung as CSP Lai

Lam Suet as Uncle

Carl Ng Ka-Lung 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

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