Demon Evolution 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

aAng, the strongest human warrior on the verge of death, has inexplicably travelled 60 years into the past, with the double-edged sword of the “strongest demon” power hidden inside him. “The only way to escape the fate of the pastis to evolve. Aang: “Don’t let yourself be a slave to your limits, break free and become a demon that reigns!”