30,000 Years ago, the last true god fell, and since then there has been no god, only the powerful demon emperor.
She is an orphan with pure demon blood, and her true body is the rare butterfly "Ghost Beauty". Nicknamed "Nidie".
He is a powerful demon emperor who adopted her and became her master.
The two loved each other. Later, he took over the natural disaster that belonged to her for her, and coupled with the old wounds tens of thousands of years ago, he was forced to reincarnate.
Therefore, she inherited his position in Ten Thousand Demon Mountains, but she has been reluctant to proclaim himself emperor and often travels to various places to look for his reincarnation.
Finally, she found him, but he fell in love with someone else, and for various reasons, the two couldn't be together, so she decided that she would protect him this time.
In the end, she lost her soul and fell into the world of mortals. He felt extremely guilty and searched for her soul to help her recover, and promised never to leave again.
The butterfly has become a dream in people's memory.