Hero Has Returned

Synopsis

After saving one world, Minsu Kim returns to Earth, only to find that he has lost everything. Consumed by despair and rage, he decides to destroy the world he once called home. In his rampage, he kills teenager Jeongsu Park and his family. However, instead of dying, Jeongsu is transported to another world, where he becomes a warrior. After killing the demon king of this alternate world and honing his skills, Jeongsu returns to Earth, hell-bent on revenge against Minsu. As the two warriors clash, the fate of their country hangs in the balance.