Replace one font with another in Chrome?

Question

So, for a touch of context, most of the web uses aliased Gulim as their Korean font of choice - see a comparison between that and antialiased/hinted Nanum Gothic here:

The former is rather painful to look at, so I'd like to replace used instances of Gulim with Nanum Gothic (via JS through user scripts, CSS through Stylish, or whatever other method would be effective). Things I've tried:

• Chrome's Advanced Font Settings extension to change the default Korean font - most sites using Korean text ignore it.
• Direct font-family replacement on * from Stylish just overwrites all fonts.
• Font-family descriptors with unicode-range specified (still overwrites all fonts so there's no fallbacks for the stuff outside of korean codepoints)
• JS override of font family on load - most pages don't explicitly specify Gulim, or any default Korean font really, for some reason (and this is probably the cause of the first attempt with the font settings extension failing).

Enabling font smoothing on Gulim would be an acceptable but not ideal solution. Since a massive shift in the use of Korean font choices is outside the scope of my skills, any suggestions as to how I can solve this from a consumer's perspective?

Answer 1

When I need to really change a font with a new one on the hard way in Css:

@font-face {
   font-family: 'MyFontName';
   font-weight: normal;
   font-style: normal;
   src: url("./myFont.file"); /*this can be an url*/
}
body{
   font-family: 'MyFontName';
}