Bad Ending Maker 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

“Please write your resignation letter, Mincheol-ssi.” I objected to the management’s billing policy, and was laid off overnight from the job I dedicated my youth to. And so, my life as Director of “Wings Online” came to an end. It’s a game I created, and a world of my own creation. That’s why… It’s solely up to me to bring this world to a conclusion. I will become the final boss and personally put an end to this game! “Now, I’ll show you what a bad ending looks like.”