Dungeon Survival Guide:What to do when the world goes crazy!

Ten years ago, the world changed forever when mysterious dungeons began appearing across the globe. From these otherworldly portals emerged monsters of unimaginable horror—and with them, the awakening of supernatural powers in certain humans. These "awakeners" became humanity's defenders, celebrities, and in some cases, its new rulers.Lee Jin-ha had dreamed of becoming a powerful awakener, imagining himself as an S-rank warrior cutting down monsters with legendary weapons or an A-rank mage commanding devastating elemental forces. Reality, however, had different plans. When Jin-ha finally awakened after years of desperate hoping, he received the underwhelming classification of D-rank scout with minimal combat abilities. His skills—Observe, Communication, Detection, and Stealth—made him useful enough to be employed by government agencies, but never respected or celebrated.As the years passed, humanity's short-sightedness became evident. Governments restricted dungeon clearing to maximize profit from monster cores and mana stones. The number of active awakeners dwindled while dungeons multiplied. The delicate balance tipped, and then it broke catastrophically.Now, Jin-ha lies dying on a blood-soaked battlefield as the apocalypse unfolds around him. Dungeons worldwide have simultaneously shattered, unleashing endless waves of high-level monsters. Even S-rank awakeners are falling one by one. Cities burn. Civilization crumbles.Behind this coordinated attack stands one man: the mysterious Void Prince, Lim Haejin, a faceless figure who commands an army of dungeon creatures through an ancient artifact. As top rankers battle desperately against the Void Prince, Jin-ha witnesses something unexpected—the villain's mask is knocked away, revealing a face Jin-ha recognizes."Isn't that... DongBaek High's Koi-face?!" Jin-ha gasps in disbelief.Memories flood back—of a quiet, awkward boy with slightly protruding fish-like features who was relentlessly bullied throughout high school. The boy who attempted suicide and disappeared from everyone's lives. The boy everyone forgot.A translucent blue window suddenly appears before Jin-ha's eyes:[Congratulations, you have peeped a secret of the apocalypse. As a reward, the universe will grant you a wish.]With death approaching and the world ending around him, Jin-ha realizes that wishing for his wounds to heal would be pointless—he would still be the same useless D-rank scout, powerless to stop the apocalypse. Instead, he makes a far more ambitious request:"I wish to go back to 10 years ago, to give humanity a chance to redo and to stop the Void Prince early."The system responds immediately:[Success. You will now be taken back to 10 years ago.]Jin-ha awakens with a gasp, finding himself sitting in his high school classroom. The date is exactly ten years before the apocalypse. His mind retains all the memories and experiences from his previous life, and remarkably, his status window shows that he has kept his awakened abilities—meager though they may be.A glowing red counter appears in the corner of his vision: [240 hours to dungeon emergence].Jin-ha has just ten days before the first dungeon appears and changes the course of human history forever. Ten days to prepare, to warn others, and most importantly, to find and connect with Lim Haejin—the bullied teenager who will one day become the Void Prince.With his D-rank scout abilities, foreknowledge of dungeon locations and monster weaknesses, and a complex bond forming with the potential destroyer of the world, Lee Jin-ha begins his race against time to rewrite the future.Can a D-rank nobody prevent the apocalypse? Can kindness change the destiny of someone fated to become a villain? As dungeons begin appearing worldwide and more people awaken to their powers, Jin-ha will discover whether the future is truly set in stone—or if even the smallest actions can alter the course of history.