After failing to overcome the tribulation, Yu Shuang became the crucible of Demon Lord Xuanji. Everyone thought that she would turn into withered bones during the harvesting, but they didn't know that she had refining the devil's origin and trapped him in the body of a weapon spirit. The junior sister Bai Heng who framed her in the past came to pursue her with the right way. Cang He, the traitor in the demon world, secretly planned a thousand-year secret treasure. When Xuanji gradually lost control and went berserk during the refining process, Yu Shuang discovered that she herself was the only variable in this conspiracy.
