In a world where demons and heavenly beings have settled their differences, peace reigns once more in the human realm. Jeon Minchul, an average college student, stumbles upon a relic from the ancient war and suddenly recollects his past as the feared demon king who once dominated the land. With the resurgence of his former abilities and newfound powers, Minchul faces a daunting challenge: can he wield the forces of light and darkness to safeguard the fragile peace?