Sorry, I can not use hangul here. First of all, if you want to study medizin, you are expected to have a certificate of bachelor degree.

Because you have studied humanities, if you want to study medical science as soon as possible, graudate your school as soon as possible. Then, of course, you need to study german to the degree of intermediate II, which is Mittel II in german. You can also take a ZMP test. At that time, you can apply to school and take a DSH test. The DSH test differs from school to school, you should have an advanced level of german language proficiency.

They will look at your SAT score and high school GPA, those of two are the most critical datum for the admission for the medical school. The university GPA is considered, but its portion in the whole admission process, as far as I know, is relatively small. But you need to check about this again.

If you don't want to finish your school, then follow below directions. First, you quit your school, then learn german and take a studienkolleg, you should have a decent score here, then you can go to medical school.

I wrote this yesterday, but I was a little bit tired, so I made a mistake. Now I fixed it.

I am not a specialist, so to make sure, you need to contact the DAAD office in Seoul and Internation office of higher german education institution like the universitat. If you have a further question, then I don't know, Sorry.