Summary Maybe Undefeatable from Kainu Manga
Maybe Undefeatable summary: Hyeol Yu is a third-rate warrior feared more for his menacing appearance than his actual skills. Branded by false rumors and endless misunderstandings, he has long been an outcast in the world of martial arts. But everything changes when Seolhwa, the woman he once vowed his life to, reappears before him as a true martial arts master.