Exorcist Mo Ran is naturally able to see demons and harbors the Divine Heart Pill within her body, making her constantly coveted by the demon kind. She forms a fox marriage contract with the nine-tailed fox Lie Jiu, and the two accompany each other along the way to handle various eerie demon commissions. Lie Jiu bears the obsession of becoming a god and also shares a thousand-year fate entanglement with Mo Ran's past life, Chu Ge. Their archenemy, the Chi Long, breaks the seal and comes into the world, setting up heavy misunderstandings to alienate the two and triggering a massive crisis between humans and demons. After breaking the contract, fighting a life-and-death battle, and crossing the River of Oblivion, the two resolve a thousand-year grievance. Lie Jiu gathers his divine soul through merits, breaks free from the shackles of destiny, and reaps a fulfilled ending of staying together with Mo Ran.