Can you recommend a novel with a female protagonist as a swimmer?

The female protagonist grew up in a small village by the sea. Her brother was first chosen to swim and achieved good results. However, he lost his life because he saved someone. After that, the female protagonist embarked on the path of a swimmer. After setbacks and hard work, a very good coach appeared and achieved very good results... She had forgotten how she met the male lead, but she remembered that the male lead seemed to be a foreign aristocrat…After the female lead retired, they lived a comfortable life.