Acceptance Rate for korean american student at SNU

Hi i am a current junior in high school interested in majoring premed/biotech eng and studying in Korea. What would be my chances at applying as undergrad to SNU? I am an american citizen who is korean. My mom has a american citizenship while my father has a korean citizenship. I have a cum GPS of 4.43 and cum ugpa 3.98. Will have taken 9 AP classes and 2-3 community college classes. Act score 31. Superscore 33. Sat around 1400~1500. Fluent in korean(speak korean at home) but have not taken any korean test.EC: varsity cross country(4years) 2years: captain, varsity track (1year), mock trial(3 years) was mvp and got team award, started school newspaper, founded philosophy club, tutor(math english korean), family responsiblities(baby sister has down syndrome), church counselor and teacher(4 years), NHS and csf (4 years), spanish honor society(2 years).