Guardian of Mortal World, Battle Between Humans and Demons

Cao Yixuan was originally just an ordinary college student. After an accident, he discovered the secrets of his body and the world. It turns out that the world is not as it seems. There are only intelligent creatures like humans. Humans, monsters, and demons stand at the same level. He not only has to face attacks from alien races, but also guard against hidden arrows from traitors of the same race. Can he survive in the new world and become the hero to end this troubled world?