Women of the Sun (2008)

Shin Do Young is an announcer who instigates the jealously of all women around her because of her superior looks, great abilities, and great background. But Do Young has a deep, dark secret. She was actually abandoned at an orphanage when she was young but luckily she was adopted by a nice couple. The couple were unable to have their own children but were surprised when their biological daughter was born. Do Young, afraid that her parents would no longer love her anymore abandoned her 5 year old little sister, Ji Young, at a train station. Years have passed and Do Young meets a joyful girl, Sa Wol, who becomes her personal shopper. What happens when Do Young's terrible misdeed is revealed and that Sa Wol is actually the sister she abandoned at the train station all those years ago?