Leo, the lost heir to the throne, lives as a humble fisherman after secretly rising to become the world's most powerful mage. Devoted to Fiona for saving his life, he expects love—but she dumps and humiliates him the moment she joins the Royal Magic Corps. When Leo's mother, Queen Eleanor, finally finds him, his true identity begins to unfold. As enemies strike from every side, Leo reveals his supreme power and returns to claim his throne.