Black Variable

Zhang Kaiven was an ordinary university student whose life revolved around his mother and younger sister after losing his father and elder brother. Everything changes when Zhang begins experiencing strange déjà vu. Familiar moments, unexplained spatial distortions, and a disturbing feeling that he has already lived through these days. He ignores it all—until a dungeon suddenly appears above his home. A mysterious barrier traps his family inside, monsters begin pouring out, and Zhang is forced to fight despite having no experience. Yet something feels terribly wrong. His body moves as if hunting monsters is something he has done countless times before. Then a mysterious system awakens before him. BLACK VARIABLE FOUND SUCCESSFULLY. Zhang gains the power of Shadow and Darkness, but with it comes a mystery he cannot understand. Why was the first dungeon opened above his home? Why does he remember a timeline where his family died? And why does the system call him the Black Variable? After surviving the dungeon, Zhang discovers a terrifying countdown. Humanity has only 26 days. Dungeons will spread across Earth, monsters will emerge, and humanity will begin to awaken. Zhang decides to face the coming disaster first, giving humanity the time it needs to prepare. But before the countdown ends, the system suddenly initiates something unexpected— Synchronization with Larhon. The mysterious God of Shadow and Darkness. When Zhang finally returns, the world he knew has changed beyond recognition. And the more he searches for the truth behind the forgotten timeline, the system, and Larhon… the more he begins to wonder whether his second chance was ever truly his own. Because Zhang Kaiven may not have returned to change the future. He may have returned because the future needs the Black Variable.