f(x) is back with '4 Walls' and 'Diamond' on Music Bank!

f(x) is back to fill your room with their latest music!

Performing '4 Walls' and 'Diamond', here is their Music Bank comeback stage~

♥ Preorder f(x)'s 4th album '4 Walls'

♥ More about f(x)'s '4 Walls' here