In the year 2126, humanity has mastered gate technology to colonize space—and wage relentless war against alien monsters across the galaxy. Space Marine Kim Seo-jun thought he had already served his time, but a forced re-enlistment drags him right back to the front lines. Except this time, on the very first day of his second term, an impossible pop-up appears before his eyes: [Status Window Activated.] Armed with game-like system mechanics in a sci-fi battlefield, Seo-jun is about to show the universe what a veteran marine can truly do when the system has his back.