To apply for studying in Korea, the minimum educational requirement is to graduate from high school or above. If you can't get the diploma smoothly because of serious warning, then applying for studying in Korea as the final qualification is to graduate from high school. Students who have no basic knowledge of Korean must first apply to enter the Language College of Korean University. After one year of study, you can basically reach Band 4, and then you can apply for undergraduate study.

If you can successfully get your diploma (because the university diploma can't be forged, and you can also find it on the Korean website), and then you don't have a foundation in Korean, then apply to the Language Institute first, and then apply to the graduate students of Korean universities.