Cast:
Michael Hui - Jimmy Fang (Reporter)/ Dr Ng Sun Kin (Gynecologist)/ Jiang Lang (Gambler)
Woo Gam - Hu Jin/ 7th Lady (Prostitute)
Guk Fung - Liu Lao Liu (Conman)
Ingrid Hu - Hu Yin YIn
Paul Chang Chung - Hu Jin's boyfriend (cameo)
Sai Gwa Paay - Mahjong den's worker
Shum Lo - Mahjong gambler
Paang Paang - Mahjong gambler
Chiang Nam (1) - Restaurant Manager
Tsang Choh Lam - Henchman
Fung Ging Man - Henchman
Liu Wai (1) - Accomplice of Juan's husband
Wong Sam (1) - Boss of gambling and sex dens
Cheng Miu - Speaker at Moral Reinforcing Society
Lee Wan Chung - Hu Jin's husband
Wong Ching Ho - Mahjong gambler
Chan Shen - Juan's husband
Wong Han Chen -
Ha Ping - Mahjong gambler
Cheung Chok Chow - Tour guide
Gam Gwan - Director

Addition:
Bak Siu Man (白小曼-Bai Xiao Man) - Yu Juan Juan
(Seducer of Dr Ng)
Ricky Hui - Panty thief

I add all after I watched the movie (sorry, not before next month I guess).

Updated.
I added some actors more and corrected some of your role names.

Michael,

Thanks for updating and please excuse my mistakes.
I am glad you checked.