Glad to meet another mom with a foreign degree wanting to become a physician. I was in a similar situation except that I'm a US citizen with a BA in English from China(and I have 4 kids). I was as confused as you are about the whole process when I first started. So hopefully I can help you with what I've learned along the way.
A few things that came to my mind.
1. Have your Korean degree and GPA evaluated by WES. The evaluation process takes time so get it done early.
2. Your foreign degree counts as fulfilling the BA requirement but MD/DO schools won't consider your overseas GPA. Depending on the schools you apply to, you'll have to complete 60-90 credit hour prerequisites at US schools. (community colleges are fine for general education classes but take your upper-level science at a 4yr uni)
3. Do look into the schools that you'll be interested in applying to and find out what they ask of foreign degree applicants. Some schools require 1-year minimum study at a US school and others want to see you doing 90 credit hour courses.
4. Get work experience in clinical and non-clinical settings as early as possible. Start volunteering if you haven't. Medical schools want to see your motivation and your servitude.
I had less than 150 hours(volunteering and shadowing combined) when I applied, which is far less than optimal, as a result, even a 4.0 GPA(calculated from >80credit hrs classes I took here) and 511MCAT can't get me an interview with UNC. The admission told me that my academics are solid but my hours smell like "checking boxes". So hopefully you can learn from my experience and also get some research experience if you can. (Unfortunately, I have zero.)
I only applied to a handful of schools in my state. Currently, I'm waitlisted at a DO school and still waiting to hear back from a MED school. If I get accepted, I'll be 35 when I start Med school. Age is only a number. I'm a lot more motivated and smarter than when I was 25. Besides, us Asian gals don't age the same way westerners do. Believe it or not, my classmates and some patients have mistaken me as a freshman even a high school student before.
)) I lived in Busan for 2yrs so I know for a fact that Korean women are experts at keeping their skin flawless!!!
Let me know if you have other questions. Good luck!