
Okay, so I never bought coins in the Korean version, but I tried looking around. I don't know any Korean, so I had to use a translator.
https://gyazo.com/863bc7af7c79af5be50fcc8a612ddf55
The option that I had bubbled in the screenshot says "Overseas Credit Card." If that is selected, then the only credit card options they accept are JCB (Japanese), Discover, American Express, and Diners Club. So if you don't have any of those, then you cannot purchase them from the Korean version. I personally cannot because I only have Visa. Haha.

I'm just now noticing this since I saw it in the next raw chapter, but Pania's bed is literally a wooden pallet with a thin sheet of cloth over it. No mattress. How she masturbate or go to sleep comfortably? Lol.
If you look closely at other panels, there *seems* to be a mattress. I think it's probably a type of bedframe that you put the mattress inside and it sort of sinks in, you know?
Or something like that..