On the day of their 20th wedding anniversary, 43-year-old Shen Nian returns home carrying razor clams, her husband's favorite. Instead, she walks in on 23-year-old Su Lian, whose slightly rounded belly reveals her pregnancy, demanding that Gu Yan give her an explanation. Faced with a year and a half of lies and Gu Yan instinctively taking the other woman's side, Shen Nian refuses to fight for him. She packs her belongings and leaves the home she has shared with him for twenty years.