OST-uesday! (f(x)'s Luna and Krystal)

Oh! it's Tuesday, and it's time for our OST or Official Soundtrack of the week!

For this week's edition, we are featuring the song titled 'Calling Out', the song which f(x)'s Luna and Krystal sang for the drama titled 'Cinderella's Sister'.

Listen to their sweet song below~

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