Cinderella's Stepsister (Korean: 신데렐라 언니; lit. Cinderella's Sister) is a 2010 South Korean television series starring Moon Geun-young, Chun Jung-myung, Seo Woo, and Ok Taec-yeon. Applying a modern twist to the classic fairy tale, the story follows the contentious relationship between two stepsisters as their lives and loves intertwine. Written by Kim Gyu-wan, and directed by Kim Young-jo and Kim Won-seok, it aired on KBS2 from March 31 to June 3, 2010 on Wednesdays and Thursdays at 21:55 for 20 episodes.