Line Walker

The details of undercover police officers are deleted from a police database and a senior officer is left struggling to know who are the undercover officers and who are the criminals.

• 
  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