The Fistfighting Genius Mage

Zed, a former MMA champion, wakes up in the body of a scrawny prisoner in a fantasy world. Reborn as a member of the once-feared Arahan family, he's trapped inside a brutal magical internment camp. With no spells at his disposal, Zed trains his body to become a living weapon. He escapes the prison with his only ally Riu, a sharp-witted inmate. Now hunted by both a ruthless warden and a noble house, Zed must fight his way to freedom only with his fists. Can a man with no magic change the rules of a world built on it?

(Source: Webtoon Entertainment)