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A human immortal emperor who was murdered by a woman, and an old fox demon emperor who was suppressed by the six tribes in the demon city. Both of them achieved nirvana because of a book of magic. One was reborn as an unsuccessful illegitimate child in a third-rate town, and the other was reborn as a wild fox on a hill in the wilderness. By chance, a man and a demon become companions and seek revenge together. But what they see and hear on the road to revenge is gradually changing them. The road lasts forever, and the love between children lasts forever. When they start all over again, they discover the people they missed in the previous life and understand the impenetrable truth of the previous life. They also did things that they would never have done in their previous life.