Personally i dont care for her voice but u might like some stuff from Lee Hyori or possibly Gummy. I find soloists arent as popular in Korea these days, which in my personal opinion stinks. As for straight pop, that might be hard. I find its more so the groups doing that stuff. With soloists its usually more so r&b & rap. Umm while BoA does do R&B n such she has done pop. U can try listening to older Korean albums like NO.1 or Atlantis Princess more so for that or many of her Japanese albums have more so pop music than her Korean stuff. I havent heard a ton from Gummy but personally she's not my thing. however she is popular.
Ummm... just for u to try, but here's Ivy's 1st album & Chae Yeon's 4th.
IVY - My Sweet & Free Day.rar
Chae Yeon - My Love.rar
oh and here's a song from Gummy on youtube.
Also heres a couple songs from Lee Hyori on yotube as well.