Dear Wolfgang, Thank you for the comment. I made a mistake during the process of combining two files(a product file and a component file). Here is a working minimal sample file. \definefontfamily[notoFont][rm][Noto Serif CJK KR] [ it={style:regular,features:{*,slanted}}, sl={style:regular,features:{*,slanted}}, bi={style:bold,features:{*,slanted}},force=yes] \definefontfamily[notoFont][ss][Noto Sans CJK KR] [ it={style:regular,features:{*,slanted}}, sl={style:regular,features:{*,slanted}}, bi={style:bold,features:{*,slanted}},force=yes] \definefontfamily[notoFont][tt][Noto Sans Mono CJK KR] [ it={style:regular,features:{*,slanted}}, sl={style:regular,features:{*,slanted}}, bi={style:bold,features:{*,slanted}},force=yes] \definefont[BigFontOnehalf][NotoSansCJKkr-Bold sa 1.5] \definefont[BigFontTwo][NotoSansCJKkr-Bold sa 2] %\definefontfamily[notoFont][math][Tex Gyre Termes Math] \definefontfamily[notoFont][math][Tex Gyre Pagella Math] \usemodule[simpleslides][style=Swoosh, font=, color=blue,] \setupTitle[color=darkblue] \setupbodyfont[notoFont,ss, \NormalSize] \setuppagenumbering[state=stop] \starttext \setupTitle[title={\BigFontTwo 여기에도 수학이?}, author={정 달 영}, institution={숭실대학교}, date={}, ] \setupfootertexts [\tfx FlexMath \hfill \pagenumber\ / \lastpage] \placeTitle \SlideTitle{\BigFontOnehalf 자주듣는 질문들} \leftaligned{\framed[]{\tfc 수학은 왜 배우나요?}}\vfill \midaligned{\framed[]{\tfc 수학은 누가 만들었나요?}}\vfill \rightaligned{\framed[]{\tfc 이거 어디다 써요?}}\vfill \stoptext However, if I remove \BigFontTwo and \BigFontOnehalf, it doesn’t show Korean title and here is the log file which tells that it is looking for Korean characters in the math font file. But all the Korean texts in the body are shown well. I wonder why it goes to math font for title and SlideTitle. BTW, is there any modification needed on the font definition? Thank you for your concern. Best regards, Dalyoung fonts > checking > char 여 (U+0C5EC) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 기 (U+0AE30) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 에 (U+0C5D0) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 도 (U+0B3C4) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 수 (U+0C218) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 학 (U+0D559) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 이 (U+0C774) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing pages > flushing realpage 1, userpage 1, subpage 1 metafun > log > overloading permanent 'condition' fonts > checking > char 자 (U+0C790) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 주 (U+0C8FC) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 듣 (U+0B4E3) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 는 (U+0B294) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 질 (U+0C9C8) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 문 (U+0BB38) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing fonts > checking > char 들 (U+0B4E4) in font 'TeXGyrePagellaMath-Regular-2' with id 6: missing pages > flushing realpage 2, userpage 2, subpage 2 close source > level 1, order 6, name '/Users/graph/Library/Mobile Documents/com~apple~CloudDocs/Documents/test2.tex'