I recommend "The Secret of the Landscape in Shallow Flowers", an ancient romance novel. The female and male protagonists liked each other since they were young, but for some reason, the female protagonist mistook the male protagonist for someone else. Later, the male protagonist took the female protagonist and fled. During the escape, the male protagonist treated the female protagonist. The truth slowly surfaced. This novel fits the plot information of the female protagonist being ugly when she was young, being a child bride, and secretly liking the male protagonist! I hope you like this fairy's recommendation. Muah ~😗