Checkpoint is a Manga/Manhwa/Manhua in english language, Supernatural 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

What if there was a save point in my life? A man that turns back the time several hundred times per day. http://m.comic.naver.com/webtoon/list.nhn?titleId=677452