Everyone Becomes a Reaper: From the Start, I'm in the Eighteenth Level of Hell

Su Yu, who came from Earth, accidentally transmigrates to another world. This is an era in which everyone is a Reaper. Anyone can awaken their own Death Realm and become a Reaper feared by all. Death Realms are ranked from F to SSS! But... excuse me, as someone who transmigrated here, it’s not too much to ask for a System, is it...? The Mythical Underworld System awakens! It can summon ghosts, gods, and underworld soldiers from the Underworld. Even the weakest under his command are Black and White Impermanence. Watch Su Yu establish the netherworld and turn the world upside down in another realm! (Traditional fantasy novel) (Underdog protagonist with a System) (The author’s ideas weren’t consistent when writing the early chapters, so there are some problems with the point of view.)