Kwai (Wong Hei) became an undercover after he left cadet school. Through the course of his investigaton, he got to know the Malaysian actress Kum (Fu Ming Hin) and Pok (Ngai Chun Kit), one of the member of the Witness Protection Unit (WPU). After Kwai accomplished his mission, he was transferred to the WPU to work with Pok. They made perfect partners and were appointed to protect Wah (Cheung Kwok Keung). Wah was in fact a deadly criminal in disguise. When Kwai discovered that, Wah immediately took action to ruin him. Fortunately, with the help of Pok and Wah's sister, Gi (Tong Po Yu), Kwai eventually succeeded to arrest Wah. 

(Under construction!)   Peter Fong's opinion and a small summary: This serie tells about the Witness Protection Unit (I never heard of this actually, always thought the CID or something will do the protection). Ngai Chun Kit and Wong Hei  plays in it. It's real fun and it has very though-about plot too!! Instead of introducing the bad-guys in each stories (like the rest of those police-stuff) it introduce them all at once!!! So you don't know who the bad guys'd be. (unfortunately you can see it from the theme-song~_~ otherwise this'd be a serie where the viewer really have to think about who the killer is)  Another proof that the script-writers CAN do a good job!! 

please send them to Peter Fong