Lingxi, the nine-tailed heavenly fox, falls to the mortal realm and is rescued by the Prince Regent, Chu Yanzhou. Relying on Lingxi's inner voice, the male lead is shocked to discover that the imperial court has been infiltrated by monsters. The cold-faced prince and the innocent spirit fox redeem each other, joining hands to slay demons and eliminate evil. At the moment of life and death, Chu Yanzhou risks his life to protect the common people, while Lingxi awakens divine power to sweep away the demons and save the people of Great Yan. To find her beloved, she resolutely discards her immortal bones to descend to the mortal realm to undergo tribulations, composing a legendary tale of punishing evil, promoting goodness, and selfless dedication.