I'm not sure if it's extremely popular. It might be well - known within certain circles of readers who are into that genre, but it may not have mainstream popularity.
I'm not sure specifically as I haven't read it. But generally, a novel with such a title might be about a powerful figure in the underworld world. It could involve things like power struggles, crime empires, and the character's journey to become or maintain his status as the 'king' in that dark and dangerous realm.
Another option is to check with your local library. Libraries have a diverse selection of books. They can either have it on their shelves or they might be able to order it from another library through inter - library loan systems. So, it's definitely worth giving your local library a try.
The following were some recommendations for novels that were similar to the King of the Underworld: " Don't Run, Hades "," The Concubine of the Underworld "," Hades in Power: A Dainty Wife Can't Escape "," Hades Chases His Wife: The Useless Second Miss of the Underworld "," The Snake of Hades "," The Strongest Killing God of the Underworld "," The King of the Seven Realms "," The Heart of Hades "," The Emperor of the Underworld Surrenders, the Concubine of the Underworld "," The Concubine of the Underworld ", etc.
I'm not sure if it's a widely popular novel. It might be a relatively niche or new release that not everyone has heard of. There could be a dedicated fan base for it among certain readers who are into underworld - themed or character - driven stories.
πI recommend a novel to you, it's called 'Those Years as a Corpse Guard at the Mortuary.' The protagonist of the novel received various rewards by burying, collecting, sewing, and completing the last wishes of the dead, including mysterious powers such as the Undying King of Hell Technique. I hope you like this fairy's recommendation. Muah ~π
I'm not sure specifically which 'king of the underworld novel' you are referring to. There could be many novels with such a title or related theme. It might be about a powerful and feared character who rules the underworld, involving stories of power struggles, crime, and maybe some sort of moral exploration.