Checkpoint is a Manga/Manhwa/Manhua in (English/Raw) language, Supernatural series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.com 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
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