The collaborative track between April's Chaewon and 'Produce 101's Yoon Chae Kyung is now out!

The song is entitled "Clock," and it's very poignant, sentimental, and sweet.  It starts off with a tinge of drama with the sound of ticking in the background, a tentative piano, and deep emotions, but then turns into a refreshing, soothing, and nice cafe track with the entrance of the acoustic guitar and the girls' sweet harmonies.

Listen above!