Dungeons and monsters have turned the world into a deadly game, and Kim Woo-Jin's Messiah Guild is one dungeon away from ending it. On the threshold of that clear, guild master Lee Se-Jun murders him to keep the glory and the dungeons for himself. Woo-Jin wakes up with the chance to do all of it again. Saving the world is no longer the plan: he climbs back up as a killer nobody can place on either side, with Se-Jun as the only target.