reST inline syntaxes are pretty much word-based, which doesn't work very well with agglutinative languages. For example if you want to apply a markup to "이 페이지" in "이 페이지는 ..." (lit. This page in This page is ...), you need to do `*이 페이지*\ 는 ...` AFAIK. That would happen every single time affixes are used, and affixes are extremely frequent in such languages.

Oh I see, you're talking about this:

  thisis\ **bold**\ text
  thisis\ :strong:`bold`\ text