I'm Not Sick

Wu Bing died from a congenital illness, but when he opened his eyes again, he found himself in a post-apocalyptic world. This world didn't require hoarding supplies, had no natural disasters, and was very stable—except for the occasional deaths and monsters. Wu Bing felt his mind was having issues, experiencing hallucinations and auditory delusions. He saw twisted black-red faces formed by interwoven lines, and heard chaotic whispers from unknown sources that seemed to seduce him. The key was that if he believed the whispers and faces, all delusions would become reality. Fortunately, with mutated monsters as companions, abnormal evil spirits to chat with, and ghostly creations to amuse him, it wasn't him who was sick—it was the world itself. — Description from novelcodex.org