It's not easy to generalize, it depends on the major.
Busan University is very famous in the top five of Korean universities in science and engineering, but humanities, business, economy and art are all ranked outside 10 to varying degrees.
Aside from language barriers, it is difficult for top majors to graduate themselves, and it is the same for China students and Korean students. If you add language barriers, the difficulty can be imagined. Most of these people can get high-paying jobs in Korea after graduating from Busan University. )
The difficulty of humanities, business, economy and art varies from person to person. It is easy to learn humanities, business, economy and Korean well without delay. No matter how good the grades are, most of them can't find jobs and have to go back to China. )
It is difficult for students majoring in fine arts to see their understanding of this major, as well as their talent and understanding.
Finally, there are professors. Some professors don't like China people. No matter how hard you try, there is nothing you can do. Some professors know the difficulties of international students. You just need to have an attitude.