You might like Lee Junghyun, T-ara, or Son Dambi. Son Dambi is my personal favorite, but T-ara's album is really good too. I don't know Lee Junghyun's music very well, but from what I've heard, it reminds me of Ivy.
Some songs:
Lee Junghyun - Michyeo
Son Dambi - Bad Boy
T-ara - Like the first time