Janggu is a Korean traditional drum, and she played a "GDFR Janggu Remix", remixing Flo Rida's "GDFR" to match her drum playing. Because of how the janggu works, she can dance and perform the instrument at the same tie.
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"GDFR" is the group's 9th song in their 'Infinite Challenge of SOREA' where they show the possibilities of Korean traditional music. Check out the video above!