Secret's Song Ji Eun will team up with her labelmate Untouchable's Sleepy for a duet.
Titled as 'Cool Night', the song will describe two lovers spending their sweet summer nights together.
A teaser photo has also been revealed featuring Song Ji Eun and Sleepy being a lovely couple as he is seen patting her head while the both of them are showing their bright smiles together.
Don't miss the release of 'Cool Night' on June 16th.