In ancient times, immortals and demons had different paths, and humans and gods were separated. Heaven was afraid that the hybrid of humans and demons would give birth to a supreme power like Chiyou that would cause trouble in the three realms, and planned a slaying that spanned three hundred years.
In order to stabilize the world, the human emperor Ji Che fell in love with the nine-tailed sky fox Yu Si. She devoted all the efforts of the fox, wolf and spirit tribes to assist Ji Che in controlling the water and the country. They stayed with Ji Che for eight years and were unable to enter the house nine times. She also has a mixed dragon descendant of the human race and the demon race. She firmly believes that humans and demons can stay together, and mountains and seas can be united.
However, Ji Che had already fallen into the trap of the Heavenly Emperor Jun. The fairy concubine Yan Li was seduced by the heavenly throne and became a hidden demon-slaying blade. Si Ming Jiyuan tampered with the destiny, and the God of Punishment sent Cang Ming to suppress the situation, and even imprisoned Ji Che's mind with the ecstasy spell. A blood feast in the name of the wedding began. Under the control of the soul, Ji Che poisoned all the demons, dissected her son and killed her wife with her own hands. Concubine Si's nine tails were cut off, and her soul was scattered. Only a trace of her soul was left, which was protected by the fox elder Cang Li into the secret realm. The holy name of the human emperor who slayed demons and quelled disasters was spread in the world.
Three hundred years later, Yu Si reshaped her body with the help of the spiritual veins of the secret realm. She returned with overwhelming hatred and hid in the human palace, stirring up the affairs of the faint king Qi Ling. She used beacon fire to play the princes, the princes killed each other, and the plague came to the world. Ji Che's human race was wiped out and its roots were wiped out. At the same time, Ji Che, who ascended to the fairy world, had his memory wiped out, but he still had a blank mind. He was searching for the truth of the past, and gradually uncovered the conspiracy of heaven to control everything, to stop the communication between heaven and earth, and to forbid the communication between humans and monsters.