Since ancient times, the gods and the underworld have not been allowed to participate in the affairs of the other four realms. During the war between the four realms, a god and a person from the underworld unexpectedly fell in love, opening the door to the four realms. At that time, it was a sensation in both the fairy world and the demon world. In order to win and survive, they frantically searched for those two people. In the end, the two were found by Xian. In order to quell the war, the two decided to extract the bones and refine them into flutes. The power of the flute can be imagined, and it also contains the Nine-Life Cat, the Demon King, and the Nine-tailed Fox, the Demon King, who once caused great chaos. It's just that there are only a few people in the fairy world who can control the flute. The last woman got the flute and calmed the war, but she fell into the underworld with only a few strands of her soul left. Perhaps no one except the woman and the demon in the flute knew that those two people still left their children in the human world...