Just for fans who've been wondering where f(x) have been, Luna updated a few photos from behind the scenes at their practice for 'f(x) the 1st concert DIMENSION 4 Docking Station'.

On January 26, Luna posted the above photo to Instagram and the message, "There's not much time until the concert, and so many thoughts are going through my head. Let's gain strength for a little longer, my members. I love you <3." Judging from the selfie, Luna definitely looks a little wiped out from practice.

She also posted the photo below of Amber and Krystal with the message, "Dimension 4. f(x) enthusiastic performance practice."

f(x) will be holding their 'Dimension 4' concert on January 30-31 at the Olympic Hall in Seoul.