Jaehwan finds his life shattered when a mysterious tower appears, forcing him and the rest of humanity to become "Tower Walkers" in a brutal game of survival. While his comrades eventually succumb to the temptation of the "Regression Stone" a chance to return to the past and escape their current misery Jaehwan alone perceives the artifact as a deceptive trap and refuses to abandon the present. This choice plunges him into a harrowing journey of absolute isolation, where he must battle nightmarish monsters and confront the existential dread of being the world’s final defender. As the layers of the tower peel back to reveal a cosmic conspiracy of staggering proportions, he realizes that the fight is no longer just for survival, but for the very essence of human willpower. Driven by a defiant refusal to give up on a broken world, he carves a path through blood and shadow to reach the summit. His ultimate mission remains clear: he will ascend to the 100th floor, shatter the tower’s illusions, and prove that humanity’s destiny cannot be reset or rewritten.