T-ara has dropped another set of teaser images, and this time it features the beautiful Hyomin!

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Out of all the teasers revealed so far, Hyomin's seems to hint at the upcoming retro-concept more so than the other members' with her more playful image as she blows bubbles and puts on mischievous expressions. 

As mentioned before, the girls' new music video and choreography will take on a musical like theme and this new retro-concept is said to have a different feel from their previous retro tracks like "Roly Poly".

The new title track, "2013 What Should I Do?" is the work of Shinsadong Tiger and Polar Bear and features sampling of the song that won the traditional University Song Festival back in 1977, Sand Pebbles' "What Should I Do?".

Be on the lookout for the other members' teasers ahead of the the girls' return on December 2!