The Murderer is a Manga/Manhwa/Manhua in english language, Drama 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

"I can see your number. The number of people you will kill in the future." If he kills before they kill, the murder will not occur. Serial killer, Number, punishes the 'Destined Murderers' one at a time under that resolution. Could his wish to create a world without murder through murder ever be accomplished?