Mystic ancestor Ling Xiao possesses Si Yao, a adopted daughter of a wealthy family, exposes Tan Yingyue's schemes, and uses magic to find spirit fragments and save the Si family. During a battle, Si Boyan awakens as the King of the Underworld, and they defeat the enemy together. The Si family shifts from rejection to adoring Ling Xiao, who regains her true form and reunites with Si Boyan after a millennium.