πI recommend Wear It Quickly: The Female Supporting Actor Arrives. This fantasy romance and magic fantasy novel is very consistent with the novel information you provided. The female protagonist had high martial strength but was ugly. She was called the Tyrannosaurus Rex. At the same time,"Wear It Quickly: The Supporting Female Lead Arrives" also covered the plot where the system made the female lead a subordinate. I hope you like this fairy's recommendation. Muah ~π