Lost Era of Hope

Ps: The content is purely for entertainment The passing of the pre-civilization era heralds the arrival of the post-civilization era, with black and chaotic skies, a rapidly cooling climate, and the occasional thick snow on the ice sheet. People can no longer see the sun. The sun has passed away and has become a kind of belief that supports some people in the post-civilization era. Living becomes a luxury, but dying is a relief. What kind of story will happen in such an era? Please see the text.