Group f(x) has made their comeback performance on Mnet "M! Countdown."

They performed their second album title song, "Rum Pum Pum Pum" and showed off a powerful and addictive song.

They all wore a vibrant red outfit concept and showed off a Scotland girl image.

Along with the addictive song, they also showed a more upgraded image beauty wise.

This song is a pop dance song that talks about first love.