First phase is a written exam. GMAT kind of thing. All the questions are easy but need to be done fast. Reasoning part seems a bit hard. But this is also the step where most applicants fail to pass to the next step. Exam result is announced in about 2 weeks. If Pass, the next step is interview session which could take between 1 and 2 hours. It consists of two sessions. The first part is interview about your personality and ambitions and missions in life. The second part is more of technical and what you did in school. (I applied for through the school where i was doing my MSc in computers.) Also needed to give a few minutes presentation of what one did in school. During the interview, there was nothing really difficult about it. Need to be honest and relaxed. However, the interviewers check if you know korean language and if you do it is a big plus.