I think it's from kkatoon.com ... Mostly bara webtoons and I don't know how foreigner's can authenticate to view the adult content on that site though. Tried doing their 1:1 customer inquiry but to no avail. If someone can share how to though, mostly appreciated...
Kkatoon can be accessed no problem as @Rainbow097 pointed, the problem is to authenticate and buy coins. To do that you need to have a valid Korean phone number it seems. So without it, one can't authenticate to see adult content nor do any transactions it seems.
@Kkatoon Thanks for the clarification. I got the second one so I'll share it here today even though I know that gay stuff is normally downvoted to oblivion here if it doesn't neatly fit into certain tropes.