I doubt there will be any in Korea. Recently went to one of their scientific conferences which was suppose to be bilingual meaning >20% of the presentations were presented in English. One seriously cannot understand the English spoken by native Korean speakers. When it came to Q&A time it was hilarious. You see two native Koreans speaking English to each other but no one understands them. I don't think they understood each other either.
From what I know (might not be that accurate) I suspect Taiwan would be better in terms of English but teaching will probably be verbalised in mandarin, and most writings in Chinese with occasional English words. Programs in Taiwan are generally 6 years plus.