When Xue Xianglan learns that her daughter-in-law is pregnant, she is overjoyed and gives her a luxury car. Unexpectedly, her son, Xue Chenglin, turns around and gives the car to his mistress, Zhang Xuerou. He tells his mistress to win over his mother at her birthday banquet, hoping to become the family heir himself. Little does he know that his mistress will offend his future mother-in-law while driving the luxury car. When Xue Xianglan discovers her son's affair and is mistaken for his daughter-in-law, she decides to play along and teach the mistress a lesson. At the birthday banquet, the mistress discovers Xue Xianglan's true identity. Relying on Xue Chenglin's support, she continues behaving arrogantly. Even when Xue Chenglin arrives and takes her side, he ends up stripped of his position as heir.