It's a Wild Start, Follow the Rules

After nuclear war... There are no more countries in the world… Human beings began to live in various cities... But under the nuclear radiation, various creatures mutated, and they began to kill humans. Humans called them demons... Some humans also mutated under this situation, and they formed a force called the Hero Association to fight against the monsters... After becoming a hero, Lin Yuan, who had wanted to join the Heroes Association all his life, got sub-god-level abilities by accident... But as his abilities developed faster and faster, he discovered that there was a huge conspiracy behind it...