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 '' . DSP Entertainment replaced with members Goo Hara and Kang Jiyoung , and Kara made their comeback with Rock U , which changed their image `` Hip-hop '' to `` cute '' and `` playful '' .