Korean songstress IU (left) and singer Sung Si-kyung (right) [Official IU Cyworld]
Korean singer Sung Si-kyung and IU made their way to the No. 1 spot on Gaon's singles chart with their latest duet "It's You" during the week of September 26 to October 2.
According to data released by Gaon on Thursday, the collaboration beat out previous week winner 2NE1, scoring their first win on the singles chart.
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