Like seegasm, Korean agent disappeared. I think Zxx_in deleted because he got frustrated with foreign fans saying they follow him because he looks like their favorite idol.
The only seegasm collaborator still active is Exwhitekorean.
I can't say why zxx_in disappeared entirely, but part of it was the pornhub purge. I remember after it happened he was pretty upset because he was unfairly purged, so he abandoned his old videos. He kept a few twitters, some getting banned again and again (korean accounts get banned very often). the last one I saw was a couple of years ago, disconnected to his old accnt names. He seemed like he was almost starting a relationship, and then *MY* account got banned, and I lost his access. He was already starting to post less and less porn around that time.
I can't say what you said isn't part of why he stopped, but I think a combo of the PH purge, relentless twitter bans for korean accounts (at random, I've definitely followed some for years, and others have to make a new one every few months, etc), and maybe he got into a committed relationship with someone (but I'm not sure on this last bit, just he had been making quite a few romantic posts before I lost his account details).
I wouldn't be surprised if he's still out there somewhere, but definitely under a very different name. I only found his newer account because I recognized him in a picture. he's definitely distanced himself from zxx_in though.