I live in Japan, which uses plugs A and B for mains connectors, and I will be going to South Korea, so I decided to buy a plug adapter for my electronics.
Searching online, all points that South Korea uses the same plug as Europe, which is type C. I've been to France and South Korea before, and it indeed seems that they both use the same plug.
However, when I went to buy the adapter, there seems to be another type called SE, which is marked for use in "Korea, France, Netherlands, Germany, etc.", while the C type is marked for use in Italy and other countries I can't remember now, but notably omitted South Korea.
It doesn't seem like "SE" is another name for "C" depending on the brand, since many brands seem to have both "C" and "SE" adapters. Check for instance this SE adapter and this C adapter from the same brand.
Based on the pictures, it seems like the SE adapter has slightly thicker prongs than the C plug.
I also couldn't find any mention of an SE adapter in English, but it is interesting to note that searching for "SE plug type" leads to C plug type related pages.
Eventually I trusted the label and went with an SE adapter, and I suppose it will work fine. But I was left curious. What is this SE plug, and what is the real difference with the C plug?