The book " The President's Domineering Love: Absolutely Doting on the Forensic Wife " matched the given information. The female protagonist married the male protagonist to save her grandmother. The male protagonist was a high and mighty president of an empire who treated women like nothing, but he doted on the female protagonist to the heavens. The female lead was a cold forensic doctor from the Criminal Investigation Unit. She was not interested in men, but the ice in her heart was melted by the male lead. The male protagonist's words were quite modern. For example, when he proposed to the female protagonist, he said," You've worked hard. When will you have time to marry me?" I recommend this novel to you. I hope you like my recommendation.😗