Thanks to your guidance, I was able to view Korean text in LibreCAD. Thank you.
However, as stated in the manual, I noticed that for non-English characters, the font strokes are displayed only as hollow outlines rather than filled shapes.

Although I haven’t searched extensively, it seems that support for Chinese characters and Korean is still not sufficient.
I hope that support for Korean will improve further in the future.
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EDIT
2026/4/16 Typo: LLF -> LFF
2026/4/19 Try: Converting some Korean support shx files(HAN.shx,
ASIA.SHX, bigfont.shx) to lff
result: Fail
BOOKMARK
2026/4/19 "LFF specification"
https://forum.librecad.org/Where-I-can-find-LFF-specification-arcs-td5158044.html#a51586632026/4/19 "SHX to LFF Convertor"
https://sourceforge.net/projects/shx-font-converter/