At the junction of the fairy world, the spiritual world and the mortal world, the evil cultivator force "Netherworld Palace" has quietly risen. Its leader, the Netherworld Ancestor, intends to break the balance of the three realms and swallow the spiritual energy of heaven and earth to achieve eternal life. The story revolves around the young human emperor Ji Yuan who has a mysterious bloodline and the nine-tailed sky fox saint Li Tianyin. The two went from hostility to joining forces, uncovering ancient secrets in troubled times, fighting against evil cultivators' conspiracies, and finally re-establishing the order of the three realms.
Emperor Jinyuan was originally a mortal warrior. Because his family was massacred by evil cultivators, he embarked on the path of cultivating immortality for revenge, but unexpectedly awakened the bloodline of the ancient gods hidden in his body. Li Tianyin is the reincarnation of a nine-tailed fox that the fox clan has rarely encountered in ten thousand years. She was ordered to sneak into the human race to investigate the abnormal spiritual energy, and her fate was intertwined with that of Emperor Jinyuan. The two join hands to unite the demon clan, spiritual cultivators and the righteous path of the immortal world to launch a war between good and evil that sweeps through the three realms.
