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The song is a remake of Acoustic Callabo's "You & I" which was released back in 2011. Dasom and 40's version has a much more classic and vintage feel compared to the original.
So far, Starship artists like K.Will, JungGiGo, Yoo Seung Woo, and Cosmic Girls' Yoo Yeon Jung have participated in 'Vintage Box' releases. Check out Dasom and 40's "You & I" above!