Kaist is the abbreviation of Korea Institute of Science and Technology, which belongs to one of the top universities of science and engineering in Korea, so kaist is a relatively difficult university in Korea. But kaist is not the most difficult university in Korea, because there are world-class comprehensive universities such as Korea University and Yonsei University. Kaist refers to Korea Institute of Technology, the first technical university in Korea and the top university of science and engineering in Korea. Admission is relatively difficult, but it is not the most difficult university in Korea. Korea's Korea University, Seoul National University and Yonsei University are also among the top research universities in Korea, which are world-class. It is also difficult to enter, and the professional emphasis of each school is different, so it is impossible to determine whether Korea Institute of Technology is the most difficult university to enter in Korea.