Grim Reapers' Corps is a Manga/Manhwa/Manhua in english language, manhwa 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

Mu-hyun, the captain of the 'Yaksha Corps'—an evil spirit disposal unit within the underworld—has worked tirelessly for the afterlife. However, he lost his precious colleagues in an instant. In order to bring them back, he must establish a union in the underworld.