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!

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