I don't think JK is on the same level as JB, and never will be. Bieber has been in this industry for so long and it's still so relevant, JK on the other hand, I don't think he'll go far. I think he has talent, but the fact that he's Korean and doesn't have English as his first language will always be a problem. Like, JB, from my point of view he's already crossed the fandom barrier, people listen to his music organically, it's not just fangirl pop anymore (sorry if I'm wrong, but that's what it seems to me when I look at what people in my country listen to). Jungkook will have the support of his fandom and may win one or two, but for the rest of the audience he will always be the kpop guy, exotic and stuff. as much as he does a good job, it's not like Canadian Bieber, British Harry, he speaks Korean and his accent is something hard to beat. So I tend to believe that there is no advantage for Bieber to collaborate with him because he doesn't gain anything from it, unlike⁷ Puth who is trying to survive. I think JK will be more successful in his own country and surroundings, not much else.