Starbucks Starfield COEX Mall R is a Starbucks store in the basement of COEX in Gangnam-gu, Seoul, a one- to two-minute walk from Exit 6 of Samseong Station. It sells coffee and sandwiches, and its Reserve format lets customers choose from five brewing methods for single-origin beans. The store is large and indoor seating is spaced out generously. It draws many customers, so seats are in short supply.