Demonic Beast Hunter Survival Guide

For 12 years, Woojin suffered from mysterious nightmares of unknown origin, until he suddenly met his death… When he opened his eyes, he found himself not in the real world, but inside the very world from his nightmares—the "Demon Realm." Using the skills he had honed all this time, Woojin hunts demon beasts and grows stronger with each kill. As a beast hunter, he begins living a brand-new life. 'A dark fantasy world where you grow stronger the more you hunt? Honestly, that's better.'

(Source: Naver, translated)