[talk] The atmosphere is good, so the song is bound to be good.

Did you see the photo posted on BTS's official Instagram?

Photos of the members were uploaded before the filming of the swim music video.
A video was uploaded showing the members all doing push-ups as a warm-up before filming.
Everyone seems a bit playful, but seeing them all getting ready together like this before the shoot looks like a great atmosphere.

Since they get along well, the singing goes better and the stage performances are bound to be better.