Time-travel background: The protagonist Lin Xiaogou, an ordinary (even a bit cowardly) 996 social animal/waste college student/delivery boy (character choice) on Blue Star, accidentally traveled through time.
Imaginary apocalyptic world: The world is called the "Ashfall Era". It is not a wasteland after a nuclear war, but caused by the spread of alien spores called "Gloom Bloom". This spore:
Environmental modification: Absorbing vitality crazily, turning the land into an ash-like desert, leaving behind strange luminous mycelium forests and poisonous swamps.
Biological aberrations: Infected organisms (animals, plants, and even some humans) will undergo unpredictable mutations and become ferocious "alteration beasts." Some people mutate into "predators" who have special abilities but lose their sanity or have twisted minds.
Lost technology: Most of the civilization of the "Bright Silver Age" before the cataclysm collapsed, leaving only ruins, relics and a small number of fragments of black technology that were difficult to inherit. The current mainstream is "scavenger technology" pieced together from rags and "biological weapons" based on mutated materials.
