Dual levelling: I level up with my clones

War breaks out between the human race and monsters, and Lee Seung loses everything to it at the age of sixteen — his family, home, and happiness. He had always dreamed of becoming powerful enough to stop the remaining monsters in the world. One day, he awakens the ability to create multiple versions of himself called "replications". With his clones, he grows stronger every time. But will this new power bring him the happiness he desires? The revenge he craves? Or will it further ruin his life? Let's find out!