The world was caught up by an Artificial Intelligence system that changed reality into a map with monsters, items, and NPCs. In this game-like world, only the ‘Master Player’ was capable of turning the world back to normal. When Na Sanggi’s family was murdered by an unknown Player, a mysterious voice told him that he must become a ‘Player’ in order to bring his family back. And so, Na Sanggi registered as a Player to uncover the truth of the incident and save his family!