It tells the story of a middle-aged woman Yu Ge and her colleague Lin Bu Mian, who is nine years younger than her. In order to cope with her relatives urging her to marry, Yu Ge asked Lin Bu Mian to pretend to be her boyfriend. They went home for the New Year to meet Yu Ge's parents and relatives. But their supposedly 3-day vacation became long-term when they were stranded because of the coronavirus epidemic. As the saying goes, "Age is just a number," Yu Ge and Lin Bu Mian eventually realized that they really have feelings for each other, and they convert their pretention into a beautiful love story.