When Shen Lanfang learns that her daughter-in-law is pregnant, she is overjoyed and gives her a luxury car. However, her son, Shen Xuanlin, secretly gives the car to his mistress, Zhou Xue'er. He instructs his mistress to win over his mother at her birthday banquet, hoping to secure his position as the family's heir. Unexpectedly, Zhou Xue'er drives the luxury car and offends the woman who will soon become her mother-in-law. When Shen Lanfang discovers her son's affair and realizes that she has been mistaken for his daughter-in-law, she decides to play along and teach the mistress a lesson. At the birthday banquet, Zhou Xue'er discovers Shen Lanfang's true identity but continues to act arrogantly, relying on Shen Xuanlin's support. Even when Shen Xuanlin arrives and takes his mistress's side, he cannot escape the consequences: he is stripped of his inheritance rights.