Yesterday, JOO and Super Junior's Leeteuk unveiled their duet collaboration, "ICE CREAM", online.  Both the digital single and the music video's popularity have been soaring, thanks to the combined interest from fans of both labels. Since fans were usually accustomed to seeing JOO sing ballads, "ICE CREAM" (which is also Leeteuk's first ever duet) came as a sweet treat for them. The song is currently rising to the top of the charts on Naver, Daum, Bugs, and Melon. Many listeners left favorable reviews, pointing out that the fun melody line and catchy guitar rhythm. The heartwarming song wittily tells about the different feelings between a man and a woman in love. Fans also remarked over how JOO and Leeteuk were able to bring so much emotion into the song, making it sound as if it were sung by real lovers. Check out the music video if you haven't already!