In Korea, millimeters are used to measure shoe size. In Japan, centimeters are used. If you take a look at the label of your shoes, they will usually list the shoe size in US, UK, EUR and JPN. If your shoe has the Japanese size in cm e.g 28cm you are in luck. To convert it to the Korean size in millimeters just add on an extra zero at the end.
If you don’t have the label, you can find the conversion chart below. As each country has it’s own shoe size system based on different measuring systems it can be difficult to get a perfect match. The chart below should be used as a guide line and you should always try them on if you can.