on de Mar (English: "Sound of the Sea") is a 2001 Spanish drama / erotic film directed by Juan José Bigas Luna based on the novel of the same title by Manuel Vicent. It revolves around Ulises (Jordi Mollà), who comes to a fishing village to teach literature at a local high school. During his stay he falls in love with Martina (Leonor Watling), the daughter of his landlord. Sierra (Eduard Fernández), a rich businessman, also falls in love with her and fruitlessly tries to win her heart.

Overview from themoviedb.org