Kara debuted on March 29, 2007 with "Break It" on M! Countdown. Their first album named "The First Blooming". In 2008, however, Kim Sunghee left the group. DSP Entertainment replaced members, Goo Hara and Kang Jiyoung, and Kara comeback with Rock U, which changed their image "Hip-hop" to "cute" and "playful".