Girls' Generation's Sunny and Super Junior-M's Henry will be working together for the last song in SM and Mystic's collaboration 'Snowball Project'.

The song "U&I" will be the last one after "Lemonade Love", the "Rebirth" remake, and the "Dumb Dumb" remake. The song is a medium tempo R&B pop song that Henry composed, wrote lyrics for, and edited. Sunny herself participated in the lyrics as well.

The song will be released on the 15th at 6PM KST.