This world, I don't know when, was divided into two. People in Shangcheng were born under the sun, had vast land, were warm and free. The people in the lower city live in a dark and cramped underground, without light all day long, and even breathing is a hidden danger. In a dark alley, a crazy old man was drinking low-quality spirits while laughing and shouting: "Noble gentlemen from the upper city! In your eyes, do we, the people from the lower city, count as human beings?"
