Temptress of a Thousand Faces - Qian Mian Mo Nu (1968)

Temptress of a Thousand Faces is the Shaw Brothers Version of Fantomas - with a twist:
Hero and Villain are actually Heroine and Villainess and the Damsel in distress... is a guy.

The Temptress of a Thousand Faces is a mysterious thief who commits crimes in disguise and is ever elusive. Police Detective Ji Ying(Tina Chin Fei), who's in love with Journalist Yu Da(Chen Liang), tries hard to get hold of the Culprit who takes on so many appearances. Being called a threat to the public on Television by Ji Ying, the Temptress gets a bit sulky and abducts Ji Ying to her subterranean dwelling. Putting on a Mask of our Heroine the Temptress commits a Robbery at a Jewellery Exhibition where Ji Ying is ordered to watch over the Trinkets.Posing as Ji, the ruthless lady not only seduces the Heroine's Boyfriend, but to his eye-rubbing bewilderment fights her rival in an identical-twin faceoff. Eventually the Temptress turns out to be a fellow female journalist Mao Li (Pat Ting Hung) wreaking revenge on society for her past as a "plaything for men".