As anticipation builds for the release of "Knock", an innovative collaboration of YoonA and the Epitone Project, on the 16th, a sneak preview has been launched. 

What seems clear is that YoonA and Epitone Project’s "Knock" will be nothing short of a feast for the senses, defined by YoonA's soulful harmony juxtaposed with the Epitone Project's indie vibe.

YoonA has shared a glimpse of her latest project with fans via her official Instagram page.