So much things are happening here. Jungkook gives Tae a thumbs up and then they laugh together. I think Tae thinks he’s doing this for his outfit but Jungkook is pointing to the curve created by the zipper of the outfit as I understand it. Tae looks dow and laughs when he finally realizes what he’s pointing at, while JK playfully hits him. Jin realizing they’re having fun in their own world and stop Jungkook literally by grabbing him by his outfit. We rarely see such obvious interference, especially on stage. I was actually quite surprised. o.O