Girls' Generation's Sunny and Super Junior's Henry have revealed an audio teaser of their upcoming 'SM Station' collaboration track "U&I".

"U&I" is described as a medium tempo R&B track with a guitar and jazzy piano accompaniment. Both Henry and Sunny have also participated in writing lyrics for the song about demanding eternal love from the one you love.

Sunny and Henry's "U&I" is due out on September 15. Check out the preview above!