Yes, here are a few underworld novels that I recommend to you: "Black Belly Not Concubine": The female protagonist is a mafia lady. She travels back to ancient times and unfolds a mafia love story. <<The Rebirth of a Beautiful Daughter>>: The female protagonist is a daughter in distress. She starts a love story of revenge with the underworld overlord. "My Princess is Too Flesh": The female protagonist is a rebellious lady, and she starts a rich love story with the youngest mafia godfather in Italian history. The three novels above were all about the underworld. The entire novel revolved around the underworld and explored the underworld culture and love stories in depth. I hope you like this fairy's recommendation. Muah ~😗