Don't Embed Fonts

noembed.tex

\documentclass{article}
\usepackage{kotex}

\newfontfeature{NoEmbedding}{noembedding}
\directlua{
  local function noembed (tfmdata)
    local properties = tfmdata.properties
    if not properties.filename then
      properties.filename = tfmdata.filename
    end
    fonts.constructors.dontembed[properties.filename] = 1
  end
  fonts.constructors.features.otf.register {
    name = "noembedding",
    manipulators = {
      node = noembed,
      plug = noembed,
    },
  }
}

\setmainhangulfont{Noto Serif CJK KR}[NoEmbedding,Renderer=HarfBuzz]
\setsanshangulfont{Noto Sans CJK KR}[NoEmbedding]
\begin{document}
가나다. Test.
\sffamily
가나다. Test.
\end{document}