What song is BTS practicing in AHL American Hustle Life Episode 1 !?!?!

Ok so I was watching the first episode of American Hustle Life (AHL) and before the part where the representative comes in and gives them a yellow/golden envelope which had money in it, the BTS members where practicing the dance to a song.

I REALLY REALLY REALLY WANT TO KNOW WHAT SONG IS THAT?

Please Help