After a series of disasters such as extreme weather, floods, and tsunamis, the remaining humans discovered that the earth's gravity had changed, causing the atmosphere to change as well.
Walking on the ground is like walking in space, and the oxygen becomes thinner. Human beings have gathered their spare technological power to build a floating city in order to save themselves.
The daughters of the Pu family are born twins, their souls are exchanged, their destinies are intertwined, one is a fool, the other is a traitor, the ethical boundaries of human nature, family affection, and scientific and technological progress, and the journey of two independent individuals growing together will show that even in the end of the world, the glory of human nature can still find a way out.
