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Hyeyeon, Uji, and Haeryung were previously in another girl group, EXID, before taking their leave for personal reasons. With the addition of Dahye, they debuted as a group on July 11, 2013, with the release of their first single "Pitapat" and its music video, starring Jo Kwon and Yoo Se-yoon. The group held their debut live performance on KBS "Music Bank" on July 12.