At the end of the calamity that brought the Investiture of the Gods, the fox demon Daji had fulfilled Nuwa’s mission to beguile King Zhou, but she too perished in the calamity. Having occupied Su Daji’s body for so long, the fox demon felt indebted to her. On the brink of death, she gave Su Daji her demon heart, imbued with immense magical power and deep-seated obsession. The two unexpectedly transmigrated.