The protagonist encounters the man in black by mistake. Unexpectedly, the man in black is a wolf demon who has lived for more than nine hundred years. The protagonist who was picked up is also forced to sign a contract with him. He must help his master get rid of a hundred demons and do good deeds to help his master increase his cultivation and become an immortal as soon as possible. But where are there so many demons in this peaceful age? If this master wants me to serve him tea and pour water, just say so!