She got the voice which is already okay. But she's too shy and don't know how to control the stage for her own. Their voice are at the same level even more than Tiffany but not pass Taengoo. But the different between them is those two, TaeNy know who to control their stage appearance. So it's common for them to steal the sportlight from her. They supposed to invited YoonYulHyoSooSun to teach her how to perform on stage with TaeNy. YoonYulHyoSoo don't have a lot of lines in their songs but everytime they on stage, they know how to make the stage become their. People will focus on them while listen to the lead singers sing. It's not TaeNy fault here actually...lol...