Oh Mother Oh Sister

SeongRi & Kyeong Bin are twins born via artificial insemination, later seperated at birth. Both twins are unaware of each other until Seung Ri's mother abandons her one day & forces her to go to her real father. Seung Ri misses her mother and has difficulty in adjusting to her new family, including her twin brother (Kyeong Bin) and 3 sisters (i.e. Yeo Kyeong, Nam Kyeong & Sae Kyeong). Her friend's brother Soo Cheol (AhnJaeWook) befriends her oldest half sister (Yeo Kyeong) who is able to hear but unable to speak due to an accident during childhood.

• Ahn Jae-wookSu-cheol
• Hwang Su-jeongYeo-gyeong
• Go SooGyeong-bin
• Kim So-yeonSeung-ri / Yu-gyeong
• Bae DoonaChan-mi
• Chang Mi-heeYoung-sook
• Park Sun-youngHaeng-ja
• Na Moon-heeSeo
• Goh Doo-shimJung-ok
• Kim Ji-youngNam-gyeong
• Ahn Jae-hwanTae-sung
• Park Si-eunBo-ra