In the cultivation world's two top sects, the Yunjing Sect and the Tianyan Sect, there is an exchange disciple system between the sects. A prophecy circulates in the world that among twins lies the chance to save the world. Yu Chang and Yu Wan are precisely a pair of twin sisters. In her past life, Lin Ge was a stepping stone for the Yunjing Sect. She gave her all to help her father Lin Xiaotian break through bottlenecks, searched for the Sword Sovereign's notes for Chu Yun, helped Shen Feng refine heart-demon pills, and cleaned up countless messes for Lu Xuan. Yet younger sister Lin Wan defected to the demon race, and after death everyone, without asking reasons, pinned all blame on Lin Ge, throwing her into the beast tide to die without a whole corpse.