Monarch of Death 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.nl fastest updating comic site. The Summary is

사령왕 카르나크 | Death King Karnak | Carnac the King of Dead Spirits | The King of Dead Souls I was a being that ruled over death. It took me a hundred years to come to a realization. A human should live a human life. One shouldn’t rule over something like that.