You would think so Graham, but my local post office disagrees! They said they need to be able to read it. I'll put the address in characters on the package as well, but I wanted to translate it as best as possible so the fussy postal worker will accept it. LOL.

You do not need to change the language of the address at all. Just make sure you write SOUTH KOREA at the bottom of the address block - that's all the USPS needs to process it. The rest is down to Korea Post.