KoreanKii is a tool that can add or remove the Korean common key, useful for preventing or fixing error 003 bricks. To fix an error 003 brick, access to homebrew is still required to launch this.

Author(s)tueidj and JoostinOnline
TypeSystem tool
LicenceGNU GPL v3
Download (source included)

This homebrew application makes permanent changes to the Wii's SEEPROM, thus, this application should be used with caution.
This homebrew cannot be used on the vWii. Attempting to use this homebrew on the vWii may result in the app not working, or may render the system unusable.

WARNING: You will 003 brick if you install the Korean Key UNLESS you are on a Korean System Menu version and/or have IOS60 installed as your System Menu IOS.

This app does not work at all on vWii and never can because the vWii doesn't use (or at least have write access to) the SEEPROM, and there never was a Korean version of the vWii. Attempting to use it on vWii will just simply cause it to freeze at the install screen.