The Regression of Great Sage Riddle is a Manga/Manhwa/Manhua in (English/Raw) 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

A young man named Riddle had lost all of his friends—and the entire world—at the hands of a mysterious organization known as the Box of Malice.Having lost all hope to live, he dwelled in a pit of despair until he has one final revelation. What if… he could return to a time before everything ended?And so, after a thousand years, a deformed Riddle finally manages to reverse time.“I’m going to stop them this time…!”Equipped with a thousand years of knowledge and experience in his young body, the Great Sage Riddle’s journey to the past now unfolds!