I recommend "The Reborn Big Boss Has Finally Fallen", a completed modern romance novel about wealthy families. The female protagonist, Shen Sangsang, was reborn after being killed and vowed to avenge herself. During the process, the male protagonist, Nie Qi, doted on her and helped her realize her revenge plan. The plot had elements of the underworld, revenge, and wealthy families. It was suitable for readers who liked underworld stories. At the same time, the male lead, Nie Qi, only had one wife, which fitted the question. I hope you like this fairy's recommendation. Muah ~😗