Speculation is rife online about Jun. K and his plastic surgery, which is probably why he was requested here. Most people assume he has had a nose job and possibly a jaw shave. It’s worth noting that Jun. K wears A LOT of make up and does contouring, especially on his nose. This makes his face look even more unnatural and “fake” than it would otherwise.
I agree he at least had rhinoplasty because his nose looks quite different from his pre-debut days, and comparatively unnatural. In general, his face looks a bit off and nose jobs can often be the main culprit of that (your nose is in the middle of your face, if you mess with it it affects your facial proportions).
As far as the jaw shaving goes, I think it’s very likely that he did something in that area. He still has a large chin but his jaw from the side looks very unnatural, like attempted v-line gone wrong. I also believe he may have had his eyes touched up, perhaps not double eyelid surgery but corner cutting to make them appear larger.
Lastly, Jun. K had some work done on his teeth/gums. He used to have a gummy smile but now sports perfectly straight veneers.
Before and after pics