If you want to see Seoul (screenshot above) you will have to go to the Korean Google Maps site as Korean export restrictions on mapping data mean Google have to serve the road map tiles from Korean servers.
The Korean map tiles have however been added to the Google Maps API. Mapperz has posted a good demonstration showing South Korea with the new road tiles and the Wikipedia and Panoramio layers turned on.
Korean Google Maps Mashups
- Naver Maps + Google Maps satellite imagery (Korean language interface)
- Tryvel - Korean photo mapping website
- My Korea - a map about Korean cities, transportation, parks, World Heritage Sites.