Hi All

Just came back from Seoul.

Been using my Chase credit cards (United Club for general purchases, Ritz Carlton for restaurants, Sapphire for Westin Chosun stay). Businesses in Seoul regardless of size all support credit cards (I didn't run into any that doesn't, street food stalls don't count), much better than Tokyo.

There were a few times I run into DCC, particularly in Lotte Department Store and its market downstairs. One time when purchasing tea, I wasn't paying attention enough so the lady hit USD fast enough and I got DCCed. The difference is only $1 so I didn't spend the time fixing it as her English was bad enough. In restaurants, I never had any incidents of DCC. Checking out in restaurants in Seoul with credit cards (even US cards) is really fast and convenient.

Used my Chase debit, with Woori Bank and Shinhan Bank ATMs, there is no ATM fee charged by the ATMs. On the other hand, Citi ATMs charge around $3, so do convenient store ATMs. So when using ATM for cash, try Korean banks.

All in all, using US credit cards (like mine with no foreign transaction fees) in Seoul is quite worry free.