A catastrophic ability. A cursed power that triggers age regression with every minor wound. Trapped in the safe zone by fields of razor-sharp grass, a cautious protagonist discovers that his conditional power—though seemingly fraudulent—might be his greatest asset in a deadly game. When goblins corner him and traditional escape routes fail, he turns to an undefeated SSS-Rank swordsman girl for guidance. Her refusal to train him launches an unexpected strategy: exploit his time loops. For three months, he regresses repeatedly, gathering intelligence and honing his sword skills through accumulated knowledge. Each cycle brings him closer to mastery, yet further from his breaking point. In a modern fantasy world governed by level systems and dungeon hierarchies, where demi-humans roam and gods pull strings behind the scenes, one man refuses to remain weak. Between kidnappings, magical threats, and apocalyptic stakes, he transforms from a helpless survivor into something legendary—the Unrivaled Swordsman destined to climb floor 44 and save the world. A Korean-style action tale blending game mechanics with gritty survival, comedic undertones with determined perseverance. His weakness becomes his weapon. His regressions, his greatest advantage. Welcome to a weak-to-strong journey where every setback is a calculated step forward.