Tensei Majutsushi no Isekai Seikatsu: Gensaku Chishiki de Sekai Saikyou

The protagonist poured his final moments into *The Adventure of Allen the Hero*, a wildly popular web novel whose conclusion fans awaited with bated breath. Diagnosed with a terminal illness and told he had little time left, he sacrificed his remaining days to finish the series. Tragically, his life slipped away the exact moment he typed the final volume's conclusion. Instead of finding peace, he suddenly awakened inside the very universe he created. Rather than embodying a powerful hero, he found himself reincarnated as Will—a talentless mob character from the earliest chapters who happens to be the eldest son of a noble family destined for ruin. Facing a miserable future and the absolute worst starting point imaginable, Will quickly realizes his unique advantage. As the original author, he holds absolute knowledge of the world: the exact timing of quests and events, the locations of hidden legendary magical items, the hidden traits and weaknesses of every monster, and the deepest secrets of the universe itself. Determined to rewrite his doomed destiny, Will utilizes his comprehensive inside knowledge as the ultimate cheat code. By altering the fate of an insignificant background character and astonishing even the legendary hero along the way, he sets out to claim unparalleled power and conquer the world on his own terms.