Shen Ci, a fox spirit from Qingqiu, seals his demonic power and lives as a mortal to repay Xia Zhi, the Lingzhi Flower Fairy who sacrificed herself to save him a thousand years ago. For over a decade, he protects Xia Zhi, who has reincarnated as a manga artist. The two grow up as childhood sweethearts, and their feelings for each other deepen. When Shen Ci’s true demon form is accidentally exposed, the elders of Qingqiu arrive and reveal the bond and crisis from a thousand years ago. Facing the punishment of heavenly law and the threat of the Black Fox, the two resolutely sign a “Live and Die Together” contract, promising to share life and death. In the end, they resolve the crisis, Xia Zhi’s manga becomes legendary, Shen Ci proposes to her, and they achieve a perfect ending, continuing their love that spans a thousand years.