Oh! Holy was a Romance Webtoon Original created by Ahyun; it concluded on June 2, 2019. The original Korean Webtoon premiered on Naver and concluded on April 17, 2018. There is a video game adaption of the series.
Who cares if you’re invisible in high school when you can see and talk to the invisible? Reserved and quiet, Jamie Oh prefers to remain in the background and confide only in his friends, who happen to be ghosts. But when the most popular girl in school takes interest in him, his normal -- or rather, paranormal -- life takes an unexpected turn.