In a time when the Demon King reigns, his demons run amok and wreak havoc on the world. In a desperate attempt to stop him, the remaining Ancient Cultivators send Li Su Su to the past to prevent a mortal from awakening and becoming the current Demon King Tan Tai Jin. Li Su Su, who became mortal after being sent back to the past, is reincarnated in the body of Ye Xi Wu, Tan Tai Jin's wife, which complicates the accomplishment of her mission.