Hello Kangmin,
thanks for pointing out how to add Japanese support. I didn't know it before. This was very helpful.
I found the cause for the problem with the not working Meiryo UI font. This font is stored in the TTC format (TrueType collection). As long as the font is installed on Windows OS the Windows own font engine can use this font without any problems. The FreeType, in turn, does not find the font file because it ends on *.TTC.
The file name, however, is not the unique problem. I patched Embedded Wizard to also include all TTC files. Nevertheless, FreeType engine refuses to work with this font. It is a more complex aspect. Officially Embedded Wizard supports TTF and OTF files only. We have to analyze the reason why FreeType ignores the TTC font and hopefully add the support for TTC in the next version.
For the moment I see following possibilities for your application case:
Option 1: Select back the Windows font engine for the font conversion. Don't use the FreeType engine.
Option 2: Convert the TTC file in TTF file. You will need a dedicated font editor/converter (e.g. Fontforge). In Internet there are diverse descriptions how to achieve this.
Option 3: Use another font which is provided originally in TTF or OTF file.
I hope one of the options can help you further.
Best regards
Paul Banach