The protagonist has seen things that others cannot see since he was a child, and he often encounters some troublesome events because of this. Grandpa said that other villages offer sacrifices to gods, but we offer sacrifices to ghosts. Yi Qinghai deeply understood what death was. Death took away his grandfather who would tell him stories, take care of him and amuse him. There is always an exchange of equal value between yin and yang. It is said that the ancestors of the priests made a living by making deals with ghosts a long time ago. The priests exchanged their lifespan for the ability to communicate with ghosts, and blood that can compete with ghosts, and even control ghosts.