<meta charset="utf-8">
<style>
.dotum {
  font-family: Arial, Dotum, sans-serif;
  text-rendering:optimizeLegibility;
}
.pgothic {
  font-family: Arial, MS PGothic, sans-serif;
  text-rendering:optimizeLegibility;
}
</style>
<p>No glyph should be drawn between two CJK letters. It's a normal whitespace.</p>
<p><span class="dotum">돋 움</span></p>
<p><span class="pgothic">ゴ シ</span></p>