The Story of Hearts (1969)

One of the twin sisters is become addicted to drugs by a villain who runs a cabaret. After a while the villain hires a guy to kill the girl but he doesn't because he loves her. The girl's twin sister is back home and comes to find her. She goes to the villain's place but he wrongly thinks that this is the addicted girl. He kills the young man who was to kill the girl but the twin sister and her friends are after him. Finally they manage to defeat the villain and save the girl.