BTS busted out their best dance moves on the December 16 airing of 'Weekly Idol,' on the urgings of the MCs Heechul and Defconn!

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Rap Monster was the first to step up and showcase his grooves to EXID's "Up & Down," despite the small secret that he didn't know the choreography. Shhh...no one must know that Rap Monster doesn't know the choreo to "Up & Down"!�

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Next up were Jungkook and Jimin, who had everyone rolling as they danced energetically to "Up & Down." Did they know the choreo unlike Rap Monster? Watch in the video to find out!