Demons Invaded, I Suddenly Became Invincible

Li Yuan traveled to a world where the world was mutated and full of monsters and monsters. When the demon attacked his city, he thought he was about to close his eyes and wait for death, but unexpectedly, he directly activated the [One Punch Super God] system. He can keep getting stronger just by throwing punches! There is nothing in this world that cannot be solved with one punch. If so, then give it another punch!