If you want to make your eyes look more korean, you could choose to wear the colored contact lenses to help you achieve this. You could base on your common clothing, color of hair and so on to choose the color in your contact lenses. Usually the dark black color contact lenses will make you look more korean.
It seems that you are quite interested in Korean people. So, as a matter of fact, the eyes of Koreans are quite similar to that of Japanese and Chinese, for they are geographically close. Anyway, if you are really interested, you should get a pair of black contact lenses, also, you should try to get some eye makeups to make your eyes and eyebrow look like theirs. You could get lots of black contact lenses at Walmart online store.