【TVPP】Hyorin(SISTAR) - Hello, Goodbye, 효린(씨스타) - 안녕 @ I Am a Singer 3

SISTAR # 166 : Hyorin participates 'I Am a Singer 3'. She sings her song 'Hello, Goodbye'. @ I Am A Singer 20150130

SISTAR : Hyorin, Soyou, Bora, Dasom
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