You didn't mention what subject your PhD is in or where you are from. Since there are plenty of people whose first language isn't English teaching in universities, but normally in a subject related to their major. I have no idea how you go about finding out about such jobs though.
The main problem I could see is that often students are not proficient in English, and if you are not proficient in Korean. General dialog is going to be very difficult.
You didn't mention what subject your PhD is in or where you are from. Since there are plenty of people whose first language isn't English teaching in universities, but normally in a subject related to their major. I have no idea how you go about finding out about such jobs though.
The main problem I could see is that often students are not proficient in English, and if you are not proficient in Korean. General dialog is going to be very difficult.