The The COEX shopping mall is located underneath the Korea World Trade Center and is one of the largest underground shopping centers in South Korea. It contains international brand name stores, a concert hall, and an extensive food court and restaurants. It even has a full aquarium, movie theater, arcade and a kimchi museum. The aquarium takes people on an aquatic journey from the Andean mountains to the Amazon rainforest and beyond.mall is located underneath the Korea World Trade Center and is one of the largest underground shopping centers in South Korea. It contains international brand name stores, a concert hall, and an extensive food court and restaurants. It even has a full aquarium, movie theater, arcade and a kimchi museum. The aquarium takes people on an aquatic journey from the Andean mountains to the Amazon rainforest and beyond.