unistUndergraduate School Admissions

Hi I'm currently a high school student in United States and I'm about to graduate in about a week, and after the graduation, I'm leaving to Korea permanently. I recently heard about UNIST, and my teachers already wrote the letter of recommendation for me. Is it possible that I summit the letter of recommendation that is not UNIST format?? I don't think it's possible for me to wait for my teacher to write another recommendation for me,,,