There are far more Koreans applying for positions in finance and consulting than non-profit, tech, entrepreneurship, or industry. So competition is tougher for the former areas than the latter. As a general rule, MBA admissions offices are broken down into domestic and international applicants. So all international applicants are competing against one another. Nevertheless, Koreans are actually at an advantage compared to Chinese, Japanese and Indian students, because far more people from those countries apply for MBAs in the US than do Koreans. It is fairly common for MBA classes to have the same number of Koreans as, say, Chinese, even though far more Chinese applied than Koreans. Certainly having some experiences in the US can be advantageous, because it resolves concerns about your ability to thrive while studying here. If you didn’t go to the US for high school, college or graduate school, that is certainly OK, but there are programs throughout the year for potential MBA applicants interested in spending a few weeks or months in the US before applying. You should definitely check them out.