Just checked ebay - you can buy the entire date run of these half won coins right now. Price wise - it doesn't come cheap but they are quite nice.
Again, as these coins were struck during the Japanese occupation, these designs are clearly Japanese. It doesn't really reflect the Korean design back then. A more aspiring Korean design would have been something like this:
Struck in Korea although I'm not too sure who the designer is. Those two coins are even tougher to find than the half won coins.