Empty-nest old man Chang Weijie (Ni Dahong) and lonely old lady Li Huiru (Kara Hui) who collects waste get acquainted with each other after a fight, but gradually develop feelings for each other; the elderly couple Xie Dingshan (Tony Leung) and Zhao Huanxin (Ye Tong) make a living by selling waste, and his wife Zhao Huanxin has been suffering from illness... Four elderly people, two couples, at the end of their lives, they love each other hard and purely. Even if there is no tomorrow, they still have to say "I love you!" to each other. The story is adapted from the Korean comic of the same name.