Dark Hole: Another Survivor is a Manga/Manhwa/Manhua in (English/Raw) 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

Black smoke. Humans are turning into monsters. Hell that unfolded in an instant. Will you become a monster to live? Or will you face hell as a human being? It has already begun. The story of the survivors you didn't know about, Dark Hall: Another Survivor!