Do any South Korean stores/restaurants accept American Visa brand credit or debit cards?

Not all ATM's will work. You will need to go to the right banks to assist you. If the machines, will not work-go inside and someone should be able to assist you. Larger cities accept US cards (Seoul, Busan ect) Most department stores will accept visa's. I lived all over Korea for over 7 years and know a lot about this country. The individual who didn't think ATM and Visa cards wouldn't work. Next time, think about making rational comments based on facts or experiences... not snap judgments.  more