Five years ago, a maid witnessed the Zheng family's daughter Zheng Liangyu in an affair and was murdered by Liangyu to keep her silent. Her daughter, Xiao Wan, studied medicine abroad and returned with plastic surgery to impersonate Liangyu, infiltrating the Zheng household as a maid. When Liangyu's parents arrange her marriage to wealthy heir Chen Yutian, they force Xiao Wan to take Liangyu's place for the wedding night due to Liangyu's lack of virginity. Over time, Chen grows suspicious of Xiao Wan's differences from Liangyu and begins developing feelings for her.