Yes, South Korea asks for a VAT report and I have done that for steam.
Normally the online store should be handling VAT so I don't have to worry about it.
But I am just checking because I will be reporting to South Korean tax authority, that I earned money from South Korean customers by selling software through itch.io and itch.io paid VAT.

I talked about the language support, because if I support those languages then there will be buyers from the countries with first language as Korean or Japanese.