I'm an Uncouth Lady, but I Helped the Villainous Young Lord but He Ended up Liking Me summary:
Agnes, who was ridiculed in the social circles for being an unfashionable noble, happened to help Nazelbert, the duke's son, who had been betrothed to the Princess. However, the Princess saw this and ordered Nazelbert to marry Agnes as punishment. Isn't it terrible to marry me as a punishment? Look, he seems to hate it too. Wait, he doesn't? This is a story about an unfashionable noble and a duke's son, who grow closer to each other.