I hope that my advices can help all the people who suffer from gluten free diet in Korea.
Celiac is not common in Korea. So it is difficult to find gluten free products.I am Korean and I lived US for 13 years and returned in 2005.
I don't need gluten-free diet but one of my family member needs that. So I had difficulties to prepare meals in Korea without gluten free products. But Korea is the rice-based society, so if you think more challenge to try Korean food, it will easy to cope with. Some Korean Traditional foods does not contain gluten.-Sulungtang, Grilled pork(Samgyepsal)
I tried to find gluten-free products. The store named Orga has Gluten-free products like cereals and spaghetti sauce.
You can find instant steamed rice any grocery store.