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f(x) have finally made their long-awaited comeback with the music video for "Rum Pum Pum Pum"!

The girls have been hard at work building up for this comeback, and now it's finally here.

"Rum Pum Pum Pum" is a pop dance track that promises to be another one of f(x)' signature genere hits. 

f(x) will kick off with their live comeback stages starting with 'M! Countdown' on the 25th.

Check out the music video here and remember to leave your thoughts below!