The wonderful partner (1960)

Wong Chat is jobless. He is forced to become a burglar. He breaks into Han Siu-yu and her boyfriend Cheung Wai-lim's home, but it is just the time when they return. Wong hides in the closet. He eavesdrops that Han and Cheung are a couple, but Han is forced to become the tycoon Chan Koon-kau's mistress for a living. Suddenly, Chan returns, and Cheung hides into the closet too. Wong and Cheung meet in the closet and become friends. Wong is righteous and promises to help Han to escape from Chan's control. Wong and his neighbour Yeung Oi-lin disguise themselves as a pair of Singaporean rich couple and attend a banquet at Chan's home. They want to steal back the document that Chan threatens Han with. But they also find evidence of Chan's drug trafficking. When Chan find out about the stolen document, he confines Cheung and Han and kidnaps Wong's children. But Wong refuses to surrender. During their confrontation, the cops arrive after being informed by Yeung and arrests Chan on the spot.