The Reversal of My Life as a Side Character 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

In the midst of a repetitive and boring everyday life, a game appeared as if it were fate—*Heroes Destiny*. After spending ten years playing it, I finally completed the game, but all that remained was the emptiness of having to return to an ordinary life. At that moment, a message appeared on the screen: “Do you desire a new adventure? [Yes/No].” Little did he know that he would wake up in an unfamiliar body and an unknown place. “Remember, I am now Calix Shaekin.” And thus… “I will become the protagonist of this world!”