Found the opening and clips from this 1999 (?) TCS series on Youtube.
http://www.youtube.com/watch?v=hHT3YJF3cvc&NR
If I remember correctly, it's about two cops (Julian Cheung and Li Nanxing) trying to infiltrate and bust drug rings in Hong Kong and Taiwan. Starring a few local artistes (Li Nanxing, Ann Kok) and many overseas artistes (Julian Cheung, Andrew Lian Kai, Steven Au, Monica Chan, Damien Lau). It's quite entertaining to watch, especially of Li Nanxing's transformation.