Devil Returns To School Days is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Good grades, a handsome appearance, above-average fighting skills, and a little bit of righteousness. On the eve of his graduation, Kim Hyun-sung gets pushed off a rooftop ends up in a vegetative state. Unable to die, with only his hearing and consciousness alive, he spends the next ten years in hell until he suddenly returns to the day the bullying began.