http://puppyisos.org/files/sfs/Puppy4.x-UTF8-locale/
user: puppy
password: linux
Download, add to bootmanager, reboot.
Then run "chooselocale", choose "local", and activate ko_KR.utf8 (for korean).
Then restart X or reboot.
Note:
this does NOT include UTF8-fonts, those had to be installed in addition (for korean, chinese, arab etc.).
Background info:
http://www.murga-linux.com/puppy/viewtopic.php?t=42664
Mark