Super Junior's Siwon, Kangin, Donghae, and Eunhyuk tease for 'Beat Burger Project'?

It looks like Eunhyuk is up again for SM's 'Beat Burger Project,' but this time enlisted the help of fellow Super Junior members Kangin, Donghae, and Siwon!  Of course, the boys, however, remain mysterious about whatever they're up to as they only write, "SJ coming soon!"

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The members posted humorous pictures they took in what looks to be a recording studio or dance practice room.  In addition, two are wearing shirts that say 'Beat Burger,' the name of the creative project that is going on at the moment, so it appears as if they might be gathered for that, but it could also be for a Super Junior comeback or casual hangout.   

Last time, Eunhyuk showed off his smooth dance moves to an even smoother jazz tune for 'Beat Burger,' so what might these four humorous boys be up to next? 

BOYS pic.twitter.com/SDdKK1zV7N

� SIWON CHOI (@siwon407) August 22, 2014