Demon in Mount Hua 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

The Murim’s public enemy, the Slaughterer Demon Monarch, Yeom Se-Ak! It’s been a hundred years since he was trapped in Mount Hua after being captured by the Sword God, Han Ho. He waited all these years for his chance to seek revenge… The long period of time caused this incident to be forgotten by the world, and eventually, even the Yeom Se-Ak was forgotten. But. “Sir, what is your name…?” A coincidental meeting, and the name of an archenemy that he said unwittingly, “H-Han Ho.” At the end of a vain journey, an unexpected path branches out. The ultimate demon that’s in Mount Hua, Yeom Se-Ak’s choice!