In order to resolve the Korean error, open your Dragon Saga folder. For most user it will be located in the follow directory and folder location:
C:\Program Files\Gravity\Dragon Saga
Within this folder, do the following:
1. Delete the file Patcher.exe
2. Rename the filed Patcher2.exe to Patcher.exe
If you are using the Gateway, please run it again through Gateway. If you are not, please re-execute the Dragon Saga client file.
If issues persist, please contact the WarpPortal Support team, here