After saving one world warrior Minsu Kim returns to Earth only to find that hes lost everything so he decides to destroy the world he used to call home In his rampage he kills teenager Jeongsu Park and his family But instead of dying normally Jeongsu is transported to another world where he finds that hes now a warrior himself After killing the demon king of this alternate world and honing his skills as a warrior Jeongsu returns to earth hellbent on revenge against Minsu As the two warriors fight with the fate of their country in the balance who will emerge victorious