Of All the Bosses in My Family, I Am the Only Real Mortal

My family is deeply involved. In order to conceal his cultivation, my father (ancient demon lord) pretended to kill chickens with trembling hands. My mother (a peerless swordsman) can tell three thousand sword intentions when she cuts a vegetable. My sister (the empress of the world) was treated as a private visitor while shopping for groceries and bargaining. And I, the only real mortal, worry about whether the chicken is laying eggs every day. Until the system released a new task: [Like ordinary people, go to the black market to bargain for a price]. That day, the price system of the entire underground world... Collapsed. "