The only one time when Lee Chaeyeon didn't need to use her easy mode of "knock knock" challenge...

and with her sister

Quote from desdesdes

and then with the Choi Yena

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lol damn Yena went so hard her hoodie fell and the video froze for me. Trying to do a challenge with the best dancer in Kpop aint easy, you have to bust ass to not look completely outmatched