Resource depletion and energy shortage. When these serious crises plagued the development of the world, human beings sang loudly and formed a huge Earth Alliance. In order to find new energy, human beings headed into space and developed the universe. However, they unexpectedly changed the balance of the world because of competition. An accident created a conflict between the alliances. When the world was looking for a way out, a mysterious young man, carrying the belief of avenging his father, broke into the world's destiny. Who knew that he was the "key" that could open the future direction of the world.