Anti-Monster Force

The Anti-Monster Force—a group of hardened mercenaries contracted by the military to combat monsters. It's not quite where Regan, an ordinary young factory worker, expected to find himself, but a drunken night out with his friend leads him to sign an enlistment form. Before he can blink, he's through boot camp and the newest member of the AMF. Despite being assigned all kinds of grueling and humiliating tasks as the newbie, Regan does his best to fulfill his duty and protect humanity from fearsome monsters!

(Source: Webtoon Entertainment)