Fortress of Doom: I Have a Heart of Fire

(Memory rebirth + scorching heat + freezing winter + hoarding + zombies + technological machinery + not a saint + protagonist is cunning and sarcastic + mild cheat)

Abnormal solar flares, extreme heat, extreme cold, and viruses.

It directly destroyed the civilization and order established by humankind.

A technologically advanced sphere, carrying Li Fan's memories, returned to Li Fan during his university years.

Reborn into this world, will Li Fan wreak havoc with a twisted mind full of hatred, or will he find his true self?

Good and evil, right and wrong, are inherently a false proposition. The story has already begun; let's wait and see.