The typical replacement re-wireable plug used over there is what we call the "contour plug".
It fits into grounded Schuko outlets. Korea has both standard two-pin ungrounded sockets and grounded Schuko types.
The Schuko sockets are mostly seen in places like the international airport at Incheon, office buildings and shops. I don't know if the ground terminal is connected to anything.
Most houses in the town I stayed in use un-grounded sockets, and if there is a grounded socket installed, you can usually safely bet that the ground pole goes nowhere.
The typical 220 volt residential system is across two "hot" or "live" legs.
The rewireable contour plug looks like this:
Schuko-type (both straight and right-angle) replacement plugs are also available.
I brought a bag load of these back home with me (along with another bag load of wall sockets and female cord connectors).
My workbench is going to look quite interesting!
[This message has been edited by SvenNYC (edited 10-07-2005).]