I Asked My Korean Mom If I Can Date a Foreigner
We were very eager to please her and ultimately had to take out a second mortgage because the trip to Korea, hotels, gifts, etc. I wish that I had sat down with her 6 years ago and said that I am American; that I have no desire to be tyrannical but I also believe it is wrong to submit to tyranny. If her parents are in Korea, perhaps they don't have much command of English.
If she is living by Korean cultural norms, you will have much more difficulty.