f(x) has finally begun the bombardment of teasers forecasting their much-awaited comeback! This is it, folks! The girls are retuning which is good enough reason for you to jump out of your seat and celebrate. 

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SM released a short, 11-second teaser on social media which revealed the date and time of the group's comeback, set for October 21 at 8pm (KST). On Instagram, the group also uploaded a mysterious symbol which coincides with the symbol in the 11-second clip. One of the pictures read, "[4 walls] An exhibit," possibly signifying that f(x) is now a four-member group, not five. 

Who's ready?? 

�http://t.co/dFMPlue7wu �http://t.co/H4oLmujgOZ

SMTOWNGLOBAL

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A photo posted by @fx_4walls on Oct 19, 2015 at 7:13am PDT