The Laughing Frog (2002)

A woman has a fine life with rewarding work, a nice house, and a serious boyfriend in the lowlands of Japan. In walks her long lost husband who years ago disappeared and abandoned her. The wife allows her lost husband to secretly live in her house. More specifically, he lives in the wife's closet. The closet has a peep hole, so he does nothing day and night but watch his wife live her life.