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, an American soldier that married her aunt. There she met Gun Woo, who was Joon Young's best friend and the son
