The protagonist is reborn: Shen Xiao, young master of the Sacred Family, originally named Shen Fei, is reborn after Nie Li destroys his family and the Holy Emperor devours his soul. He awakens two sets of memories:
- His previous life's failure as a villain
- The “Sacred Demon Codex,” which he unexpectedly acquired and which shares an origin with the Book of Time and Space Demon Spirits, but has opposing attributes
