Coffee Bean COEX Westin Seoul is a cafe in the COEX underground shopping mall that sells coffee, tea, and cake. The large space has gaps between seats, and a full glass window looks out onto the main road. It stays reachable from COEX after 10 p.m., and a separate smoking booth makes it a place to stop by after a late meal. The ceiling is high and the distance from the next table keeps conversation from echoing loudly.