A Very Romantic Story in the Very Big City (1989)

Pimsai went to San Francisco to find her boyfriend. She doesn't know that he went to go be a boy-toy for an old widow. He sold his apartment to John. Pimsai, thinking her boyfriend is still living there, goes to the apartment and sleeps in John's bed. Since she has no place to go or any contact with her boyfriend, John lets Pimsai stay and they become roomates. He takes her to work at a friend's restaurant. That's just the beginning of their story.