Because of human greed, the ground has been destroyed by them, so they stretched their hands to the sky and the underground world in the prophecies. People used technology to shape the swimming clouds into top surfaces and lived on them. Because their delusions exceeded God's, they called this place "heaven"! Wherever the greedy rich live, where there is no rule of law and money is everything. The underground world is the original environment of the earth and has not been destroyed. People want to gain benefits from it, but humans with evil intentions are ejected as soon as they go there. Therefore, it has become a gathering place for people with good intentions, but how could they give up! They found that they could get through just by carrying their newborn child. Because of the development of science and technology, the gap between the rich and the poor is huge. Society has begun to turn back the clock and regain slavery. Those who have no money are left in forgotten and dilapidated areas. Selling slaves is very profitable, especially for declining nobles or beautiful girls with a certain background!