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Faced with imminent defeat and certain death, would you choose to run – or continue to fight for a doomed world? When mysterious towers appear across the world, summoning monsters that prey on mankind, this is the choice presented to the Tower Walkers – adventurers with special powers to fight the monsters. On the brink of death, they can choose to use a “regression stone” to return to the past for a second chance, though this decision places them in a separate timeline forever. Stubborn Tower Walker Jaehwan rejects this choice, choosing to fight for the original timeline, and learning shocking secrets about the Tower along the way. A man who didn’t regress when everyone else returned back to the past. Humans were suddenly summoned to become “Walkers”, and they needed to clear the tower to save the world. . . Floor 77: The “Stone of Regression” was discovered. Walkers could now “return” to the past. Slowly, everyone left. . . Humanity’s last hope, “Carpe Diem”, was formed, made up of people who refused to abandon the world. . . The last Walker reached floor 100. He no longer knew what to believe.