A long, long time ago, a mountain god violated the rules of heaven and was deprived of eight points of his spiritual power. He was demoted to the mortal world and guarded a land for five hundred years. During this period, he was not allowed to enter or leave the place, let alone cause trouble. If he abided by the agreement, his spiritual power would be returned when the time limit was up, and he would be free in heaven and earth from then on. If he committed a crime, he would have to go to Ming Mansion to be punished, and then he would be able to see the light again, and his spiritual power would not be returned.