Doomsday Zombie Army

[No heroine][No system][No golden finger][Mutation evolution flow] In 2057, a mysterious virus named Z spread across the world, turning thousands of people into bloodthirsty zombies, and those bitten by them were quickly infected and turned into similar zombies... As a scientific researcher, Sean, the male protagonist, was surrounded by zombies in a desperate situation. He took a self-developed and untested medicine and gained the ability to regenerate. From then on, he started an infinite road of evolution... Become an invincible superpower, but just want to lie down and stay out of it...