The Splendid Love in Winter(1974)

Mimi asks handsome Chan Chi to drive her home one night, when she is short of money. They meet several more times at the restaurant, and Chan Chi eventually asks her around to his place for supper. She doesn't turn up, so he goes out to a swingers party with his publisher. He is shocked to find Mimi there, as the escort of a playboy. In a confused confrontation afterwards, Mimi decides she is not good enough for Chan Chi, and she vanishes. Chan Chi decides he really loves her, and commences the search.