The Possessed Grappler

Ji Chul Min, a perpetual loser, suddenly gains the ability to see ghosts one day. Because revealing this power would cause spirits to haunt him, he desperately acts like he cannot see them. However, a persistent ghost eventually catches onto his secret and begins following him around everywhere. As it turns out, this haunting ghost is a former Jiu Jitsu monster. Original Webtoon: KakaoPage, Daum