Supreme Demon Return 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

A foolish Prince Consort abruptly transforms into a Demon Emperor dual cultivating the Demonic Secret Art and Primeval Secret Art demons frightening the world! Stepping on vile characters, taking sworn brothers under his command, embracing beauties and accomplishing the strongest Demon Dao Path!