- Accepts Credit Card
It's a huge place but there are no many brands. You can go eat (there's variety in the food court),take a walk, go to SM Town or watch performances (Live Plaza).
It has an area ... of which 144,000 square meters are on a single underground floor, making it Korea's largest underground shopping mall. https://en.wikipedia.org/wiki/COEX_Mall
Great building to come and enjoy time with family and friends; it has everything: department store, lots of restaurants and cafes, bookstore, movie theatre, hotels, shopping, and more.