Xue Caicai and Lin Qingxu are on their way to the Civil Affairs Bureau to get divorced when a time-space device sends them twenty years into the future. There, they must complete the important task of helping their only child, Lin Chaoyang, a high school senior, work hard and get into a good university. A couple who married in a flash on a burst of passion and now plan to divorce just as quickly are forced to struggle for survival in a highly automated, inflation-ridden future. In a twist of fate, one becomes a math teacher and the other their son's classmate, all so they can get closer to him. Thus begins a hilarious stretch of days filled with tears, passion, and heartwarming moments. Along the way, Lin Qingxu gradually realizes his mistakes in the marriage, and his feelings for Xue Caicai deepen. Xue Caicai, meanwhile, comes to see the depth of Lin Qingxu's love for him. As they spend time together, they correct their behavior and make up for the many regrets that would have haunted their lives if things had followed their original course, coming to understand the true meaning of marriage.
