When Liu Li was young, he was entangled by a ghost under a mulberry tree that was formed by the power of pure yin because of his special constitution that could purify the mixed yin energy and resentment in the world. In order to get rid of this Yin ghost, I had no choice but to help this Yin ghost collect the power of pure Yin and refine it into its true body, thus embarking on a long road of groping, growing and becoming stronger in the darkness.