- TV Show: Cinderella's Stepsister (English title) / Cinderella's Sister (literal title)
- Revised romanization: Sinderella Eonni
- Hangul: 신데렐라 언니
- Director: Kim Yeong-Jo
- Writer: Kim Kyu-Wan
- Network: KBS2
- Episodes: 20
- Release Date: March 31 - June 3, 2010
- Runtime: Wed. & Thurs. 21:55
- Language: Korean
- Country: South Korea
PlotEun-Ju (Moon Geun-Young), who lost her father many years ago, finally moves gets a new family home when her mother remarries. Although things seem to have turn the better for the cynical Eun-Ju, she immediately faces problems when she meets her new step-sister Hyo-Seon (Seo Woo). Hyo-Seon with her bright character is the apple in her father's eyes and the clear favorite in the house. Furthermore, Eun-Ju's mother also seems to have fallen for the charismatic personality of Hyo-Seon.
Making matters worse for Eun-Ju, Hyo-Seon seems to like Eun-Ju's prince Ki-Hoon (Chun Jung-Myung). Eun-Ju decides then and there to take matters in her own hands and exact revenge on her Cinderella like stepsister ...
- "Cinderella Sister" will take over the Wed. & Thurs. time slot previously occupied by "The Slave Hunters" (Chuno) and will be followed by "Bread, Love and Dreams" on June 9, 2010.
- Cheon Jeong-Myeong] & Ok Taek-Yeon (member of K-pop group 2PM) have been casted for "Cinderella Sister". Cheon Jeong-Myeong plays a character like a prince but with a scar and has a love triangle with the stepsisters Hyo-seon & Eun-ju. Ok Taek-Yeon plays Jeong-woo a character that is honest & funny and also in love with Eun-ju.
|Moon Geun-Young||TaecYeon||Chun Jung-Myung||Seo Woo|
|Song Eun-Ju||Han Jeong-Woo||Hong Ki-Hoon||Ku Hyo-Seon|
|Lee Mi-Suk||Kim Kap-Su||Kang Sung-Jin|
|Song Kang-Suk||Ku Dae-Sung||Yang Hae-Jin|