Dear Otared,

I am sorry that the sample code is not fully loaded. 
Although Hans said that we don’t need  ‘makempy’, I copied the whole code again for the sake of test.
\setuphead[section][style={\effect[outer]}] is working well.

For korean, use \setupbodyfont[unfonts] as Hans said.

Thank you. 

Best regards,

Dalyoung


Tha sample code below runs correctly, except that the Korean words are not displayed, since there is no body fonts set up for that language.
Could you please send a more complete sample in order for us to see what you are reporting?

Best regards: OK

\setupbodyfont[unfonts]

% the following is copied from makempy manual.

\startuseMPgraphic{text}
  graphictext \MPstring{string} scaled 4
    withdrawcolor \MPcolor{blue} withfillcolor \MPcolor{gray}
    withpen pencircle scaled 2pt ;
\stopuseMPgraphic
\startuseMPgraphic{number}
  graphictext \MPstring{string} scaled 10
    withdrawcolor \MPcolor{red} withfillcolor \MPcolor{gray}
    withpen pencircle scaled 2pt ;
\stopuseMPgraphic
\def\TextCommand#1%
  {\setMPtext{string}{#1}%
   \framed
     [frame=off,offset=overlay,height=3cm,width=\hsize]
     {\useMPgraphic{text}}}
\def\NumberCommand#1%
  {\expanded{\setMPtext{string}{\currentheadnumber}}%
   \hsmash
     {\framed
        [frame=off,offset=overlay,height=3cm,width=\hsize]
        {\useMPgraphic{number}}}}
\setuphead
  [section]
  [distance=0pt,
   textcommand=\TextCommand,
   numbercommand=\NumberCommand]
%\setuphead[section][style={\effect[outer]}]

\starttext
\section{First One}
This worked fine before. %이 전에는 잘 되었습니다.

\startformula
\int f(x) dx 
\stopformula

\section{Second Two}
Who made the Euler font. x, y, z

$x^2 + y^2 =  z^2$
\stoptext