A drunken confession shattered Su-Hyeok's ordinary life when his friend claimed the impossible: he'd regressed, returned to the past itself. Desperate and cryptic, his friend declared Su-Hyeok humanity's sole salvation before vanishing into the mysterious tower. Now forced to follow, Su-Hyeok discovers a world of regressors, trials, and impossible challenges—yet none of it fazes him. Armed with overwhelming natural talent that defies all expectations, he ascends the tower with raw power alone, crushing every obstacle and outpacing those who came before. In a realm where regressors and systems rule, one man's pure, devastating ability becomes the ultimate game-changer.