With beasts appearing in the world, billions of people have died to the catastrope. Part of the survivors who barely survived became "metahumans", who would be able to face off againdt the beasts, and a huge gap existed between metahumans and the humans who weren't able to become metahumans. Kim Seonwoo, a regular human guide for the metahuman's beast subjugation. On the verge of death for the metahumans, he heard a voice in his head."Kill them.""Kill them and take their power!"