Yeah the size limitations for east-asian languages have been discussed before in the
Japanese and
Chinese threads before, there's no easy way to work around it.
An option might be digging up old game fonts, as they usually had custom bitmap fonts to preserve readability in very small screen sizes.
Still good job, the custom font seems to work well.
Could you explain how you created the font in case it's useful for other translators? Also are there any special rules (numbering, wordwrapping, etc.) that OpenXcom needs to be aware of for formatting Korean text, or does it work fine?