PePeRo is the best place to get authentic Korean food in Charlotte.  I always go there for my Korean grocery needs but I find myself going there more often for a quick meal.  It is tucked in the back of the market and is not fancy by any means, but the staff is friendly and helpful.  If you have never had Korean food before, ask for a recommendation (bulgogi and chop jae good for beginners) and you won't be disappointed.  It will be fresh and delicious!