A conspiracy by a hospital nurse to switch babies 18 years ago caused the fake daughter Lin Wan to grow up in the wealthy Su family, while the real daughter Su Yue struggled in poverty. When the truth was revealed and Su Yong was taken back to the Su family, Lin Wan's fiancé and Su Yong's childhood sweetheart Gu Chengyu discovered that Su Yong was the "little moonlight" who saved him in childhood. In order to keep her position, Lin Wan did not hesitate to drug Su Yong to frame her, but unexpectedly caused Su Yong to become pregnant with Gu Chengyu's twins...
