Board Thread:M.U.G.E.N Help/@comment-31236753-20170205122038/@comment-28896136-20170205175107

Then enter kor_frisk in the select.def and make sure both the character's .def file and then name of the character's folder are both kor_frisk.

Alternatively, you can enter kor_frisk/korfrisk.def

If that doesn't work I'm afraid there isn't really anything else I can do