Conversation so far:
What was the line up changes Kara (South Korean band) faced?
member Kim Sung-hee suddenly announced that she would be leaving the group.
Why did she leave the group?
parental pressure because her participation in the group was contingent on the maintenance of her grades.
Who was she replaced with?
DSP stated that the second album that was recorded would be shelved and replaced by a mini-album to come in May; in addition, two members would join the group.
What were the names of the two new members?
Auditions were held, and the two new members were eventually revealed to be Goo Ha-ra and Kang Jiyoung.
What is "Rock U"?
The group made their return in the music industry as a quintet on July 24, 2008 with "Rock U" on M! Countdown.
How did this album do on the charts?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Park Gyuri attributed their popularity increase to their "pretty but natural" appeal, while media reports gave credit to the band for finally finding its own identity.
Did they tour at all?
CANNOTANSWER.

Question: What career break though did they have?
Self-contained rewrite: What career break though did Kara have?