Nick Cheung
Blue
Louis Koo
Shiu Chi-Long
Francis Ng
Q sir/Inspector Q
Charmaine Sheh
Ding Siu-Ka
Hui Shiu-Hung
Foon Hei-Gor
Li Guangjie
Tung Pak-Ho
Drama
Action
Crime
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.
