f(x) received their 2nd '4 Walls' win from this week's Music Bank!

We all knew that their win from yesterday's M Countdown was just the beginning.

Staying true to that, f(x) has just received their 2nd '4 Walls' win from this week's Music Bank.  Enjoy their winning performance below~

Congratulations f(x)!

♥ Buy f(x)'s 4th album '4 Walls'

♥ More about f(x)'s '4 Walls' here