The king Is Back 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

Heaven is closed, hell is full. The king of the underworld, Chen Yan Luo, died and became a high school student! “I wanted to be a normal person, flirting with the school girl and going to my father-in-law’s house for dinner, but there are always rivals who come uninvited, so fuck it, I’m going to show my cards! ah shit, here we again!”