Over the course of thousands of years, the whole world has entered an era of coexistence with ghosts. Only a few tenths of human beings are left, and the number of ghosts has exceeded humans! With the adaptation of nature and the survival of living things, everyone will choose a "soul-controlling object" after birth. Through acquired growth, they will continue to cultivate their own souls and use their souls to control ghosts. The world calls them "soul masters."
