Shopping Faceup artists in South Korea?

Maybe DollSN? They are a South Korean doll company that does faceup commissions as well. They have several faceup artists on staff and will do faceups for the blank heads you send them.

I haven't commissioned them before, but have bought a few of their dolls through their Etsy shop and their customer service is pretty good. They've always been quick to reply to my messages and questions there.

Here's the faceup commission page on their English site and here's the faceup commission page on their Etsy.

 

The wonderful Poppy (Poppymind on Instagram) is in South Korea.

Edited to add:
Another famous face-up artist is Regnodoll, I can't believe I forgot them.

 

You should check out CREAM CHEEEZE (@ppimm_jj on Instagram), she speaks English really well, and her work is simply stunning! I have commissioned her twice and she's been very understanding and replied almost immediately, considering the time difference for me.
Sairin (@sairindoll) also accepts international commissions and speaks English as well, so commissioning them shouldn't pose a problem. Nuit (@nightnuit) and Rose Pompon (@pompon0123) are also great, though I have never commissioned these artists myself.
There are plenty of other amazing artists in Korea, however, I'm not sure if they speak English or are willing to try and communicate using a translator, since that can be quite stressful.