f(x)'s Luna and Amber teases fans for their SM Station 2 single 'LOWER'

f(x)'s Amber and Luna will soon be back to amaze their fans!

That will be through their SM Station 2 single titled 'LOWER'.  It will be released on the 5th of January at 6PM KST and while waiting for that, you can now see their first teaser picture below~