Su Wanwan, an ordinary college student, possesses the rare "Yuehua Blood". He was selected as the destined person by the nine-tailed fox fairy Gu Chengyuan. After accidentally opening the Yin and Yang Eyes, he was involved in supernatural events. Tough, brave, and curious, he gradually grows from panic to independent when faced with ghosts. She has a gentle and delicate heart, changes from ignorance to firmness in her feelings, and longs to be loved and protected.
Gu Chengyuan, a nine-tailed fox fairy, is the current head of the Gu family of Xuanmen. He has cultivated for thousands of years. He looks cold and aloof, but in fact he is affectionate and devoted. As Su Wanwan's "fiancé" and master, he taught her how to catch ghosts. He is wise, steady and decisive. He treats Su Wanwan with the care of an elder and the passion of a lover. Carrying the mission of the Fox Clan and Xuanmen, he makes a difficult choice between responsibility and love.
On her eighteenth birthday, Su Wanwan faced a life-or-death disaster, which was resolved by the nine-tailed fox fairy Gu Chengyuan in the form of a marriage contract, but she unexpectedly opened her yin and yang eyes. After that, she was attacked by ghosts one after another, and found that her "moon blood" could enhance the power of ghosts, attracting various forces to compete for her. Under Gu Chengyuan's guidance, Su Wanwan learned the art of ghost hunting, and their relationship gradually warmed up. At the same time, the Xuanmen family's conspiracy, the monster's calculations, and the mysterious organization hidden behind gradually surfaced, and a war concerning the balance between Yin and Yang was about to break out.
