BTS photos show JYJ working hard at the studio for their '2014 Incheon Asia Games' theme song 'Only One'

As the goodwill ambassadors for the '2014 Incheon Asian Games', the handsome trio made sure to put in a lot of thought into their song for the festival, "Only One". The photos show JYJ having fun but knowing when to get serious while recording their song.

Get ready to get pumped up with their "Only One" MV, which will be unveiled on the opening day of the festival on September 16!