My Items Can Level Up in the Apocalypse

(Zombies, mutated beasts, sci-fi weapons, ruthless protagonist) The night before, Feng Weiwei was playing judge on the subway. When he wakes up, he discovers that the whole world has changed. The good news is that he can upgrade items. After killing every zombie in the city, he realizes this is only the beginning... Wooden sword → Iron sword → Juque → Nuclear-powered flying sword Basic protective gear → Arm-mounted multifunctional attack-and-defense shield → Arm exoskeleton → EXO exoskeleton → Thor-powered armor → Iron Man suit (The synopsis doesn’t do it justice. Please give the story a try.)