We recently reported about the collaboration between IU and Sung Shi Kyung for a�duet track titled,"It's You." Well after a long wait, the track was finally released today! It's been a while since we've heard Sung Shi Kyung sing, as he put his career on hiatus in order to fulfill his military service. Yet fans shouldn't worry about disappointment - composed by Kim Hyung Seok, the ballad track showcases IU and Sung Shi Kyung's beautiful and harmonious vocals. "It's You" has been hot amongst music charts right off the bat, grabbing the #1 spot in the real-time music charts of Soribada, Cyworld and Monkey3. Without further ado, check out the track below.