First, I would like to mention that the students at KAIST are outstanding and are equal to those students abroad at MIT, Stanford, and other first-rate universities.
Also, students should always be searching for how they will live their lives in the future, since their career and life paths must be chosen soon after graduation.
Finding this life path involves taking a variety of different classes and participating in many activities during the undergraduate life.
There may be more realistic problems that come with doing what you want to do, but these problems tend to go away as you pursue your desired lifestyle.