I believe that none of the Dragon listings on the CH store are specifically from Korea. Most of them are Western, Western Hybrids, or ancient Dragon races. There are however Chinese Dragon types that aren't listed on there; perhaps because they're not as popular. So you can use the custom conjuration request to ask for the Chinese Dragon type, but from Korea.
You could talk to CH through the helpdesk about it and they might be able to help you figure something out.
https://shop.creepyhollows.com/custom-c ... gory_id=43
I don't know anything about Imugi, I assume it's a folklore tale. I have 8 Dragons, 4 are Western types and Western Hybrids, one can shape-shift, one's real size is about a Waif Fae (the one with huge wings), one has the Dragon head but body of a horse, and one is Eastern type from Taiwan.
The Eastern type of Dragons will have the sleek, long serpent-like body; some have horns, some don't. They're all full-fledged Dragons; they don't just become like those in movies or of typical Western races.
I also find that Elemental Dragons are similar to Chinese and Eastern Dragons because ancient Asia focused more on agriculture, which may explain why these beings typically manipulate elements around them. You may also want to use this listing as a starting point and ask for one from Korea.
https://shop.creepyhollows.com/custom-c ... escription