In a world overrun by monsters, only the chosen can survive. In the year 2024, during Halloween, a catastrophic event known as “The Great Catastrophe” turns the world into a living hell, overrun by horrific monsters. Only a handful of people—those with extraordinary compatibility—are granted superhuman powers to fight back. Among them, K, an S-Rank Adaptor, serves as a loyal “dog” of the organization, battling nightmarish creatures on the front lines… until he dies in a brutal mission. But death isn’t the end for K. When he opens his eyes, he finds himself reincarnated as a baby— Four years in the past, in the year 2020, before the catastrophe ever happened. Now armed with his memories, knowledge of the future, and a second chance at life, K prepares to face the coming apocalypse head-on. This time, he won’t be just an S-Rank soldier— He’ll be the one who saves the world.

Original Webtoon