The choreographer wrote that his "biggest worry was how to showcase a Korean stage. What we thought of after a long debate was the kkwaenggwari, a traditional instrument representing Korea."

He also stressed that they "chose to work with a more free rhythm and free tempo than a systematic, set rhythm and tempo, for the sake of the Korean kkwaenggwari's signature energy." 

He finished with, "Unfortunately, this is footage from the second day of practice, and I do not have any other footage of our work, so I am uploading this after talking to Jongin about it." 

Watch Kai's practice and process work below.

SEE ALSO: "It's a bit cruel," TripleS's Xinyu reveals that the 24 group members are arranged in the order of photo card sales in the group photos

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A post shared by Jae, (@beatburgerjae) on Feb 26, 2018 at 6:52am PST