Foxes have nine tails, and one tail lasts two hundred years, but there are very few nine tails, and nine tails can rival the Emperor of Heaven. According to legend, the first nine-tailed fox was a brother-in-law to the Emperor of Heaven, and promised that the nine-tailed fox would be able to freely enter and exit the world of heaven and man for generations to come. However, after tens of millions of years, only two nine-tailed foxes appeared. Originally, the third one had already appeared, but he sacrificed all eight of his tails and disappeared from sight after that...
Concept: There are demons in the world, but demons can live for thousands of years. Can humans bear the love of demons? Can a demon change its mind for thousands of years?