Conversation so far:
What happened in 2008?
group was scheduled to have their comeback in March 2008 with their second album, however, member Kim Sung-hee suddenly announced that she would be leaving.
why did she leave?
parental pressure because her participation in the group was contingent on the maintenance of her grades.
did they have a replacement?
Auditions were held, and the two new members were eventually revealed.

Question: what were the members?
Self-contained rewrite: what were the members introduced in Kara as replacement to Kim Sung-hee?