The app works as it should, but its only for people who can understand Korean. The details section of the app suggests its bilingual, but its not.
Anyway, this app works. You can use/recharge your Starbucks card and send gift cards from your phone using mobile payment. Also, you can use "e-Frequency" which is an automated ordering system by scanning a QR code from your phone without waiting in line and ordering at the counter. The U.S. is just starting to get in on that, btw. As functional as it is, its not very user-friendly. Clearly in need of a new design to match iOS 8s standards and an English language option for non-Korean speakers.
However, you can still use the U.S.-based app to search for locations which is a lot more user-friendly than the Korean version, but thats it.
The next update IMO should merge the U.S. apps UI design with the Korean apps functionality... and not just another "bug fix".
andyhpak about 스타벅스