DevilUp - Manhwa 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

Silas Reinheart has lost his family and the love of his life, only to awaken in hell facing the consequences of his dying words. He had cursed the gods and blamed them for the horrors struck upon his village, dooming him to an eternity of torment. But when a Devil offers Silas a deal, his fate is altered allowing him to return to the world of the living and collect souls as the Devil’s Spawn. If Silas refuses, he and his loved ones will be lost for eternity, however if he accepts the Devil’s contract there is a chance he can save the souls of those he lost.