Breakers

Ju In-gong was dragged into the remake of a game he was playing called Knight Saga:Re. However, something wasn't right. The only playable characters should be Loch of the human side and Zephyr of the demon side. Instead, he awakens in the body of Siutra—the ninth prince of the Demon Realm, a character who actually didn't exist in the game's story. Granted two mysterious powers, "Protagonist Setting Adjustment" and "Power of Conquest," Ju In-gong now must alter the game's plot to survive against Zephyr. Yet, with every twist of the plot, he garners more attention... (Source: Naver, translated)