A wish made almost as a joke brings Shen Yaoyao face-to-face with the deity Siyue. As they spend their days together at the mountain god's temple, she gradually falls for him and witnesses the truest forms of love between countless spirits and humans. Then she discovers that Siyue is a fallen god who has lost his divine status and suffers day and night from the backlash of a curse. Determined to break the curse, she travels back three hundred years. But she never imagined that she herself is the source of Siyue's curse.