Currently, Korean is considered an unsupported locale in RHEV, which means that it is hidden by default from the locale drop-down in the welcome page / login pages.
After the recent Korean translation improvements (https://gerrit.ovirt.org/#/c/42590/, https://gerrit.ovirt.org/#/c/42635/), need to make Korean a supported locale so that it will appear in the locale drop down like the other supported locales.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHEA-2016-0395.html