The World After the Fall Manhwa

Humans are summoned to become Walkers and must climb a tower to save the world. When the Stone of Regression allows Walkers to return to the past, people gradually abandon the climb and leave the present behind. Those who refuse to give up form Carpe Diem, humanity’s last hope. But after the final Walker reaches the tower’s 100th floor, he no longer knows what to believe. This is the story of the only man who does not regress while everyone else returns to the past.