T-ara is technically the only girl group from 2009 hallyu wave who's consistently active
4Minute: Disbanded
Rainbow: Disbanded
After School: Hiatus for 2+ years
2NE1: Minzy left, hiatus for 2+ years
Secret: Sunhwa left, hiatus for 2+ years
f(x): Sulli left, it's been over a year since last comeback.
Protect and treasure them in a way that they're like rare gems

https://www.youtube.com/watch?v=xJHUKzz1vss