So I'm traveling in s.korea visiting family and thought I should give people the heads up about using the 28 degree credit card in Korea. Most of the time it does work without a problem but in 10%-20% of times it doesn't work and you get a standard response that this card cannot be used in Korea.
It is still definitely worth using but to save embarrassment or inconvenience have cash on hand as well.
I saw a forum topic from 2015 but thought this was worth it's own thread. I should also say this is in Jeollanamdo (Jeonnam) which is the least developed area of Korea and I suspect you may have less troubles in Seoul and Busan.
Visa?