Nightmare in the Lonely City: I Woke up from the Toilet

When a veteran wakes up from the toilet, he unexpectedly comes into contact with the source of the disaster. The contagion started with him. I thought it was a zombie apocalypse, but everything started to mutate one after another. An unknown virus or a corporate conspiracy? His name is Tu Fei. In the end, he became the true nightmare of all forces in this lonely city of nightmares. ?