Ruanruan, a rabbit spirit, secretly drinks the Hundred Flower Brew and falls into the mortal realm, crashing into Wen Jingshu, the regent's son who is cold and aloof, highly poisoned, and paralyzed in both legs. Ruanruan believes he is her master who has been missing for years and clings to his side, and her immortal energy accidentally awakens the prince's legs. After Ruanruan transforms into a human form, the two heal each other and their affection gradually grows. However, her true identity, their past lives across multiple generations, as well as the conflict between immortals and demons and the court crisis emerge one after another. In the end, Ruanruan renounces ten thousand years of cultivation, staying in the mortal realm to spend her life with Wen Jingshu.