A fantasy of ancient times, a time of troubled times where demons were rampant. The boundaries between humans and demons are strict and they don't trust each other. There is a kind of evil magic circulating in the world, which can enhance one's own cultivation or achieve some ulterior purpose by refining demon elixir or taking the essence of demons. Shen Weizhi, a down-and-out scholar who looks as gentle as jade, actually suffers from heart disease and has a paranoid and gloomy personality. By chance, he rescued an injured little fox and regarded it as his only solace. Why did Shen Weizhi skin the little fox he lived with day and night to make clothes? Is this a cruel price for cultivating immortality, or is it some weird way to extend one's life? Did the little fox really die completely, or did it "live" by his side in another form?