what he may have gotten:
-nose job
it's pretty obvious that Namjoon's look has grown and developed as years pass being leader of BTS. (ik y'all are thinking of that debut perm but that's not the only thing that has appeared to change)
Here's some pics of Namjoon from the beginning of BTS' career:
and some recent pics:
as you can see, the tip of his nose is considerably slimmer and more pointed than before. his nostrils also seem slimmer and less broad? therefore I think it's fair to say he's had a nose job aka rhinoplasty.
but anyway, Namjoon's also an amazing rapper so check out his songs and support BTS :)