Twin sisters Lin Weiyang and Lin Ruowei are reborn together. On the day of the grand ceremony, Lin Ruowei snatches Lin Weiyang's red string, tricks the officiant Gu Hongwen, and gets her wish to become the 'Heavenly Marriage' bride. However, the heavenly marriage is actually a human sacrifice to block disasters for the entire county. Lin Ruowei is eroded by evil energy, her lower abdomen bulges overnight, and disasters spread across the county. Lin Weiyang awakens innate divine power and the source-tracing skill 'Wang Qiushui', goes up the mountain to gather herbs to cure the people, and discovers that the black jade pendant sealed inside the statue is an evil object used by a corrupt official a hundred years ago to seal a river monster. Gu Hongwen uses sacrifices to extort wealth and repeatedly frames Lin Weiyang after noticing her. Lin Weiyang steals the evil jade and the corruption ledger, holding the criminal evidence. In the end, as the river monster is about to break the seal, the biggest crisis in Qingshui County arrives.