"Autumn Tale" is the first of the four dramas that make up the "Seasons" series, also known as "Endless Love." Yoon Joon-suh and Yoon Eun-suh grow up as brother and sister, but in reality, Eun-suh was accidentally switched at birth with another baby girl at the hospital where she was born. When Eun-suh has an accident, the mix-up is discovered because her blood type does not match that of her parents. Eun-suh’s life is turned completely upside down when the two girls are switched again. Shortly afterward, the Yoon family leaves for the United States, while Eun-suh remains in Korea to live with her real family in extreme poverty. Years later, Joon-suh returns to Korea, and by chance—or by fate—the two children, who had lived as brother and sister for years, are reunited.