Outside of Country applying to Korean Universities - NOT International Student

I was born in Korea and I completed 1st grade education in Korea, then started 2nd grade here. According to “international application,” you can only apply internationally if you completed all education outside of Korea. So, how do I apply to Korea universities in this case since I cannot apply internationally? And would I need to write the essays in Korean or in English? Can I just take SAT and submit those too? How do they interpret SATs and my achievements?

Also, are they really strict on these requirements – I only completed ONE grade in Korea… will they still not let me apply internationally?