In my highschool education in Korea 30 years ago, we had no writing what so ever. At all. Not even in Korean literature class. Everything was about memorizing facts and multiple choices. Math were also memorizing all patterns after basic understanding. Oh we copied a lot. Most of us had a great penmanship.
It had it’s strength and weakness. Well more weakness. So Korea has adopted a lot from the U.S. education. It’s math and science are still stronger overall up to high school. But past college and where innovation and real problem solving, and not better putting numbers in already solved(developed) formulas, is required, it’s far behind of it.
Those international students with strong math and science background are highly successful in the U.S. often because they are guided by those who are educated in the U.S. who have better problem solving skills, at least in the first few years of their new career.
After living decades in both Korea and in the U.S., and having translated some really poorly written technical documents written by highly educated people into English, I can attest that, in general, Americans writing in English are far better writers than Koreans writing in Korean.
None of them, well, almost all of them do not send their kids to study in Korea.