O Boi Misterioso e o Vaqueiro Menino (1980)

Young man who makes a living making surfboards falls in love with a girl from high society, but suffers a shock to discover that she felt a strong attraction for his father. She didn't know which one was the father of another but is determined to stay with son, now don't care about her. So, she decides to marry a former fiancé, who has never been in love.