1. Install Korean language pack
# apt-get install language-pack-ko
2. Configure
# locale-gen ko_KR.EUC-KR
# dpkg-reconfigure locales
3. Change LANG value
# vi /etc/default/locale
LANG=ko_KR.EUC-KR
4. Reboot
5. Check
# locale
LANG=ko_KR.EUC-KR
LANGUAGE=ko_KR:ko:en_GB:en
LC_CTYPE="ko_KR.EUC-KR"
LC_NUMERIC="ko_KR.EUC-KR"
LC_TIME="ko_KR.EUC-KR"
LC_COLLATE="ko_KR.EUC-KR"
LC_MONETARY="ko_KR.EUC-KR"
LC_MESSAGES="ko_KR.EUC-KR"
LC_PAPER="ko_KR.EUC-KR"
LC_NAME="ko_KR.EUC-KR"
LC_ADDRESS="ko_KR.EUC-KR"
LC_TELEPHONE="ko_KR.EUC-KR"
LC_MEASUREMENT="ko_KR.EUC-KR"
LC_IDENTIFICATION="ko_KR.EUC-KR"
LC_ALL=