Yun Jun Seo and Yun Eun Seo grew up as siblings, but Eun Seo was in fact from a different family, as there was a mix-up at the hospital where she was born. The switch came to light when Eun Seo was involved in a car accident, and it was discovered that her blood type was different from that of her parents. Eun Seo's life took a complete turn when the 2 girls were returned to their respective families. Soon after, the Yun family left for the States and Eun Seo was left living in sordid conditions with her real family in Korea. Years later, Jun Seo returned to Korea, and by chance, the two former siblings were reunited.
(Source: DramaWiki)
