f(x) unveiled Amber's teaser pictures for their 4th album '4 Walls'

It's f(x) Amber's turn to tease fans!

Here are her teaser pictures from their upcoming 4th album named '4 Walls'~

♥ Preorder f(x)'s 4th album '4 Walls'

♥ More about f(x)'s '4 Walls' here

Credits:
SMEntertainment