IU recently revealed a cute photo of her and Sung Shi Kyung on her Cyworld on September 26th. In the photo, IU is smiling brightly and looking much like the younger sibling of Sung Shi Kyung. IU wrote, "The last of my Chuseok holiday was spent with Sung Shi Kyung sunbae~ Oppa was really nice to me~ Let's meet again~ kekeke". According to Sung Shi Kyung's agency, Jelly Fish Entertainment, Sung Shi Kyung and IU recorded a new duet song over the Chuseok holidays. The photo itself is said to have been taken during the recording.  "They had to record it over the holidays because of conflicting schedules." The duet song is titled, "It's You", and was composed by Kim Hyung Seok. The ballad track will be released on the 28th. Source + Photo: Star News