I recently came across a Korean font called Spoqa Han Sans. It attracted me due to its simplicity and readability. However, I didn't like its English glyph (based on Noto Sans, which I didn't love to death as well).

After a while, I figured how to define a language range for each font. While importing a font face, we need to add unicode-range.

@font-face {
  font-family: 'Spoqa Han Sans';

  /* Omitted */

  unicode-range: U+AC00-D7AF;
}

U+AC00-D7AFis the unicode range of Korean glyphs.

Can't find @font-face?

In most cases, we add either of the following statements to define a font.

<link href='//spoqa.github.io/spoqa-han-sans/css/SpoqaHanSans-kr.css' rel='stylesheet' type='text/css'>
@import url(//spoqa.github.io/spoqa-han-sans/css/SpoqaHanSans-kr.css);

This way has an advantage that I do not need to care about updating the font. It automatically updates when the font is updated at the font server (Of course, this could also be a disadvantage in some cases). But we cannot define unicode-range in this case. So rather than importing the scripts like above, we could copy & paste the actual script itself. Access the URL provided in your @import statement with https: in front of it, and you will find the license of the font and its @font-face statements.

Copy this value and add them to your CSS, then define the unicode-range. Note that this method will not automatically update your font, but you can always recopy & repaste when the @font-face in your @font-face gets updated.