Modern girl Ruan Yunchu accidentally transmigrates into a book, receiving a mission to save Jiang Xu, who had a tragic ending in the original novel. Years ago, when demonic beasts escaped, Jiang Xu risked his life to save his fellow sect members, only to be framed by the Qingyun Sect, bearing infamy and suffering immense hardships. Ruan Yunchu accompanies him all the way, firmly trusts him, and publicly exposes the sect's conspiracy during the great battle, helping Jiang Xu clear his grievances. Just as the mission is completed and she is about to be forcibly sent back to her original world by the system, their deep bond breaks the rules of the other world. Love defies the heavens to change fate, Ruan Yunchu successfully stays, and from then on the two stay together never to part.