Labelmates B2ST's Junhyung and 4minute's Gayoon joined hands for passionate ballad titled "Nightmare" for the hit drama 'Yongpal'!

It's the second digital single OST released by the drama, and Junhyung's signature rap and Gayoon's beautiful vocals are the perfect combination. It's a sad song about feeling like you're in a 'nightmare' because you're separated from the person you're still in love with, but their awesome collaboration may just erase any nightmare from your mind! 

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It's a beautiful OST worth your listen!