Bai Liusu, the "Dinghai Shenzhen" of the Architectural Design Institute, has excellent skills, but is considered an "orphan" by her family because of her severe social fear. In order to reassure her seriously ill grandmother, she urgently needs a "stable relationship". Chen Ci, the youngest director in the public relations industry, is well-rounded, but because of a secret past, he needs a perfect "married" persona to compete for a partner seat. Two people living in parallel worlds came together because of a carefully analyzed "Marriage Cooperation Agreement." There was no romantic proposal, just terms in black and white, down to the number of times a week we would go to our parents' house. The two agreed that the time limit for performance of the contract was two years. After the cooperation was completed, they broke up. But when he stood up for her when she was in a career trap, and when she turned on a light for him at three o'clock in the morning, this performance with different intentions seemed to start to quietly lose its focus.