The war between the Monarchs and Rulers has ended. The world believes that balance has been restored. But one anomaly remains—Sung Jin-Woo, the last Monarch. With the Monarchs eradicated and the Rulers victorious, Jin-Woo stands alone, a being that should not exist. Yet, as he embraces his new reality, a greater force emerges from the void—The Arbiter, an entity beyond both Monarchs and Rulers, tasked with correcting the imbalance left in the wake of war. Labeled as a mistake that defies fate, Jin-Woo must now fight not for the world, not for humanity, but for his very existence. As the Arbiter moves to erase him from reality, Jin-Woo faces an enemy unlike any before—one that does not seek to kill, but to unmake him entirely. With his Shadow Army at his side and his indomitable will unshaken, Jin-Woo prepares for the battle that will decide everything. Will the Last Monarch carve his own path once again, or will he vanish into oblivion?