Have you ever seen the sea? It is the origin of all things.
In 2118, due to the depletion of fresh water resources caused by over-exploitation of the earth, the weakening of the magnetic field, and the irreparable holes in the atmosphere, the earth officially entered the end of the world.
In 2121, mankind collectively entered the underground to survive.
May 3, 2189…
It has been 68 years since humans completely migrated underground...
Author [Although they are both called Earth, they are completely imaginary, and the terrain is completely different (?°з°)-?]