"Cinderella's Sister" cast members Kim Kap-soo and Seo Woo [KBS] KBS TV series "Cinderella's Sister" maintained its position as the most-popular drama on Wednesday and Thursday nights, blowing away its competition in the same prime time slot with solid ratings. According to statistics released by TNS Media Korea on Friday, "Cinderella's Sister" surpassed the 20 percent mark this week with...

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