Doomsday War Demon

If one day, the world is polluted, zombies are rampant, and human beings' bad nature is exposed by an environment where life is worse than death. Can't see the future, can't see hope. Luo Xuan, who came back from ten years later, obtained the system. How to do it. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.