After saving another world, the hero Minsu Kim finally returns to Earth—only to find that everything he once cared about is gone. Consumed by despair and rage, he decides to destroy the very world he once fought to protect. During his violent rampage, a teenager named Jeongsu Park and his entire family become victims of Minsu’s destruction.

Yet instead of dying, Jeongsu is transported to a different realm, where he discovers that he has been chosen as a hero as well. After defeating the demon king of that world and honing his abilities through countless battles, Jeongsu eventually returns to Earth with a single purpose: revenge against Minsu.

Now, two heroes shaped by tragedy stand against each other in a battle that could decide the fate of their entire nation. Only one of them will emerge victorious.