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Fraternal twins Si-yeon and Si-ah couldn't be more different. One never wants to leave her room while the other is a big K-pop star.
Kim Na-hyun
Kwon Shi Ah
Hong Yun-hwa
Kwon Shi Yun
Dong Hyun-bae
Ban Hae Sung
Yang Hak-jin
Han Kyo Suk
Jo Hye-won
Kim Ji-sung
Hye-jeong
