Deon Hardt, perceived as a revered and sociable figure, is far from reality—a battle-hungry enthusiast untouched by defeat. In truth, he is a frail individual plagued by health issues like coughing blood at the slightest stress and acquiring sunburns swiftly. However, a misconstrued identity thrusts him into the role of 'Demon Arut,' the infamous 0th corps leader of the demon army and the demon king's wildcard. Amidst the human-demon conflict, Deon navigates a treacherous path to ensure his survival.