E.U. (Emergency Unit)

Main Role

• 
  Michael Miu

  Kong Sai Hau

  Main Role
• 
  Sammul Chan

  Lee Pak Kiu

  Main Role
• 
  Ron Ng

  Chung Lap Man

  Main Role
• 
  Kathy Chow

  Ching Yeuk Sam

  Main Role
• 
  Jason Pai

  Si To Chiu

  Main Role

Support Role

• 
  Michael Tse

  Laughing Gor

  Support Role
• 
  Casper Chan

  Yiu Ling Ling / Cho Ling

  Support Role
• 
  Dominic Lam

  Wu Cheuk Yan

  Support Role
• 
  Jerry Koo

  Koo Wing Fai / PC66916

  Support Role
• 
  Mat Yeung

  Kwok King Cheung

  Support Role
• 
  Jess Sum

  Ho Wing Chi

  Support Role
• 
  Samuel Kwok

  Lam Sun Kang (Lam Sir)

  Support Role
• 
  Ellesmere Choi

  Kwok Kai Chiu

  Support Role
• 
  Sam Leung Support Role
• 
  Ng Wai Shan Support Role
• 
  Alice Fung Support Role
• 
  Chiu Lok Yin Support Role
• 
  Andy Sui Support Role
• 
  Lau Kong Support Role
• 
  Jim Tang Support Role
• 
  Kwok Tak San Support Role
• 
  Amy Ng Support Role
• 
  Wada Hiromi

  Chi Gun / WPC66574

  Support Role
• 
  Sammy Sum Support Role
• 
  Joseph Lee

  Pang Ho Leung

  Support Role
• 
  Yu Chi Ming Support Role
• 
  Anita Kwan Support Role
• 
  Stanley Cheung Support Role
• 
  King Kong Lee

  Hon Chi Chong

  Support Role
• 
  Deon Cheung

  Yuan Ka Chin / Yuan Sir

  Support Role
• 
  Vincent Cheung Support Role
• 
  Coson Leung Support Role
• 
  Peter Pang

  Tang Yau Ling (Police Unit)

  Support Role
• 
  Leo Tsang Support Role
• 
  Simon Lo Support Role
• 
  Yaka Fu Support Role
• 
  Tony Kwong Support Role
• 
  Cayley Mak Support Role
• 
  Gregory Lee Support Role
• 
  Wong Man Piu

  Tin Chut

  Support Role
• 
  Yoe Biu Support Role
• 
  Jacky Yeung Support Role
• 
  Cecilia So Support Role
• 
  Cheng Ka Sang Support Role
• 
  Pauline Chow Support Role
• 
  Eric Chung

  Dr. Chan

  Support Role
• 
  Kitterick Yiu Support Role
• 
  Hoffman Cheng

  Ngai Horn Sung (Police Unit)

  Support Role
• 
  Albert Law Support Role
• 
  Oscar Chan Support Role
• 
  Kitty Lau Support Role
• 
  Alan Luk

  Au Zhan Ki

  Support Role
• 
  Adam Ip

  Wan Chin Pang

  Support Role
• 
  Mark Ma Support Role
• 
  Man Yeung Support Role
• 
  Elanne Kong

  Kong Yau Yau

  Support Role
• 
  Chun Wong

  Fai Hung

  Support Role
• 
  Forest Chan Support Role
• 
  Glen Lee Support Role
• 
  Daniel Kwok

  Sung Hin Lung

  Support Role
• 
  Gordon Siu Support Role
• 
  Jacky Lee Support Role
• 
  Suen Kwai Hing Support Role
• 
  Oscar Leung

  Chan Jung Woh

  Support Role
• 
  Kaki Leung

  Fa Yeuk Bo

  Support Role
• 
  Lee Hoi Sang Support Role
• 
  Eddie Law Support Role
• 
  Rocky Cheng Support Role
• 
  Lam Lei

  Do Yik Tin

  Support Role
• 
  Jason Lam Support Role
• 
  Chloe Nguyen Support Role
• 
  Martin Tong Support Role
• 
  Hugo Wong

  Kwan Ga Keung

  Support Role
• 
  Shally Tsang Support Role
• 
  Ho Chun Hin Support Role
• 
  Dickson Lee

  Lam Suk Chuen

  Support Role
• 
  Jimmy Au Support Role

Guest Role

• 
  Mandy Wong

  Cheung Shu San

  Guest Role
• 
  Bobo Hoi Guest Role
• 
  Joe Yau

  (Ep. 12)

  Guest Role
• 
  Georgina Chan Guest Role
• 
  Chiu Shek Man Guest Role
• 
  Brian Burrell

  [Superintendent] (Ep. 11)

  Guest Role
• 
  Otto Chan

  Qi Bing (Ep 6)

  Guest Role

Bit part

• 
  Chan Min Leung Bit part

Unknown

• 
  Wong Wai Tong Unknown
• 
  Jenny Wong Unknown
• 
  Helen Ng Unknown
• 
  Patrick Dunn Unknown
• 
  Sin Tik Kei

  Kong Yau Yau [Young]

  Unknown