Sad Sonata is a love story about two men and one woman. The young Joon-young, who was raised by his mother who sold liquor to American soldiers, met the blind Hae-in and they became childhood sweethearts. Then, Hae-in immigrated to the U.S. following her aunt and her uncle[American soldier that married her aunt]. There she met Gun-woo, who was Joon-young's best friend and son of a very rich man. (mydramalist.com)