I think it's Hoseok but I have some sense that it might be someone else from the members.

LMAO THIS GOT ME SO CONFUSED, I THOUGHT SOMETHING WAS GOING ON SO I WENT AND SEARCHED THIS UP, MY BAD XD BUT I JUST READ THE COMMENTS AND ITS MEANT TO BE ABOUT YOUR YOONGI FF. IM ABOUT TO RE READ IT ANYWAYS RN BECAUSE I LOVE IT SO MUCH SOOOO BBRBRBRB

I say J-Hope, just because it'd be really interesting if it was the case, and there has to be a traitor in both teams for the infiltration to work ;P Though, JYP could possibly fit the bill too....

I'm a bit confused is it the 'He' who ordered not to touch her? Hm the leader of some gang? Probably the one who shot yoongi