Better to Meet the King of Hell Than Evil

In the magic city of Blue Star, a young man in his twenties appears, standing at 2.05 meters tall with unusually thick bones and lean, muscular build. He possesses innate monstrous strength, making even boxing champions and ancient martial arts masters no match for him. He targets only wealthy families, collecting protection money, which is essentially extortion... After collecting from the wealthy, he moves on to ancient martial arts sects, then to other realms to collect spirit stones and treasures from various sects... — Description from novelcodex.org