Conversation so far:
What happened in 2008 to the South Korean band Kara?
South Korean band Kara was scheduled to have their comeback in March 2008 with their second album, however, Kim Sung-hee suddenly announced that she would be leaving the group.
why did Kim Sung-hee leave South Korean band Kara?
Kim Sung-hee suddenly announced that she would be leaving the group due to parental pressure because her participation in the group was contingent on the maintenance of her grades

Question: did they have a replacement?
Self-contained rewrite: did South Korean band Kara have a replacement for Kim Sung-hee?