Murderer 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

In this world, rumor has it that there's a mysterious and huge organization that gathers well-known people in society, the Daoist Association. Each core member of said Association has incredible powers. They are super murderers and supreme moral practitioners. Asin, a man bound by anger and sorrow, has only one purpose: to destroy them!