A modern girl named A Zhi accidentally travels through time and becomes the reincarnated form of the Sacred Maiden of Mountains and Seas. Yun Ling, the guardian of the ancient covenant, has waited a thousand years just to find her. The Xuan You Cult lays deadly traps at every turn, forcing her to use her purifying power. Each time she uses it, she loses a piece of her modern memories. Just when they finally find happiness together in a little courtyard, A Zhi is kidnapped. A spell that seals memories wipes away her entire past, turning her into the Sacred Envoy Ling Su. As fate closes in at every step, can Yun Ling defy destiny and bring back the girl who came from the modern world?