I recommend "Rise of the Wealthy Class, Return of the Resplendent Queen" to you. The female lead is Resplendent, the third-ranked assassin in Hell, and the male lead is the overlord of the business world in S City. The female protagonist came to assassinate him under the orders of her superiors, but after a mistake, their lives entered the same track. Although the female lead had hurt the male lead, he treated her like his life and doted on her. The male protagonist doted on the female protagonist very much. He once said,"You are my queen. You are the well-deserved Queen of Brilliance. Your Majesty, marry me." I hope you like this fairy's recommendation. Muah ~π