I went to a wedding yesterday--American woman and Korean man--the second that I have been to in Korea. It was very nice and well-planned. (I do have to say that Korean wedding culture is way too obsessed with picture-taking.)
The wedding took place--as do many/most--at a "wedding hall", which is just that, a facility for weddings, not a religious place. The outside of the 4-5 story building wasn't pleasant, but the large room where the wedding took place was very nice.
My co-worker's wedding was religious in nature. In fact, there were two pastors, since it was bilingual.
After the ceremony there was a buffet dinner, which was large and offered up a variety of good food.