In the back mountain of Shushan Mountain, the fox demon Gu Ran transformed into a human, but secretly fell in love with him because he accidentally caught sight of Xu Baili, the chief disciple of Shushan Mountain, practicing swordsmanship. Xu Baili was framed by his fellow disciple Zhao Pingzhou and charged with murdering his master and rebelling against his family. He became blind and fell off a cliff. Gu Ran risked his life to rescue him, hiding his demon body to accompany him, and the two embarked on the road to escape and seek medical treatment.
The love quietly grows in the interdependence of life and death, but the taboo of the different paths between monsters, Xu Baili's belief in "killing demons and eliminating demons", and the fear of Gu Ran's identity being exposed keep this relationship hanging on a thread. As the demons attacked the mountain and the demon queen led her army out of the valley, the three-hundred-year-old feud between humans and demons was completely ignited. In order to save Xu Baili, Gu Ran did not hesitate to expose the identity of the fox demon and block a fatal blow. And Xu Baili, who learned the truth, made a decisive choice between the people of the world and his true love.
