In the case of upgrading from junior college to undergraduate course, as long as you graduate from undergraduate course, it is the same to apply for Korean graduate students and ordinary undergraduate graduates. However, it is difficult for students who graduated from Peking University to apply for Seoul National University, because Seoul National University is the educational capital of South Korea and a national university, and it is very difficult to apply. However, Korea University, Yonsei University and Sungkyunkwan University also belong to the top universities in Korea. It is relatively simple to apply. After all, the threshold for applying as a foreigner will be lower. However, Korean topik has passed CET-4 or CET-5, and English has IELTS 6.5 or TOEFL 80 or above, so it will be much easier to apply. Moreover, if you have this level of English, you can directly apply for graduate courses taught in English in GSIS or GSP, GIP and other top universities in South Korea, and you can study in South Korea without Korean grades at all.