Monolithic spires pierce the skyline, vomiting nightmare creatures that have pushed humanity to the brink of extinction. For those gifted with the power to climb, death isn't necessarily the end—it's a choice. When a floor becomes a deathtrap, every survivor is offered a way out. A single regression stone is all it takes to abandon a doomed reality, rewinding the clock to start over in a fresh timeline. It is an easy escape, a chance to fix mistakes while leaving the current world to rot. One by one, the heroes of mankind vanish into the past, deserting their posts to chase a better future elsewhere.

Among the deserters stands Jae-Hwan, a lone "Tower Walker" who refuses to take the coward's way out. While his comrades fade into white light to seek redemption in another life, he crushes his stone underfoot. He is the last man standing in a dying world, convinced that running away is just a slow form of surrender. Armed with his blade and a refusal to die, he begins a lonely ascent to ensure his own survival and clear the final floor. But as the manhwa strips away the lies of the system, he realizes these towers aren't here to test humanity. If it is not a trial, what are they actually harvesting?

Also known as: Myeolmang Hu-ui Segye, 멸망 이후의 세계, The World After the Fall.