Hi arisara37,
Welcome to the Apple Community
We are all Apple users, like yourself, in this community, so we can not speak for Apple.
Different stores, and / or countries likely have different policies in place.
and
You might need to check with your financial / credit card / provider for international payments and fees.
You could likely check with Apple Store Customer Service at 1‑800‑MY‑APPLE
(or, check with the store(s) in Korea for their policies.)
There are more than 20 Apple Online Stores in countries or regions around the globe.
There is an International Store Directory to find out if an Apple Online Store serves Korea.
or
Here is a list of Apple stores located in Seoul
Korea - Apple
or you might want to search for stores in other cities in Korea:
Find Locations - Apple
All the best :-)