@Wolfgang,

Ran your example (unsure about all these \definefontfamily commands), but does not work, a lot of errors 

======
mtx-context     | warning: no (local) file './context_cjk', proceeding
mtx-context     | run 1: luatex --fmt="/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en" --jobname="context_cjk" --lua="/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=1 --c:fulljobname="./context_cjk" --c:input="./context_cjk" --c:kindofrun=1 --c:maxnofruns=9 "cont-yes.mkiv"
This is LuaTeX, Version beta-0.89.4 (TeX Live 2016/dev) 
 system commands enabled.
open source     > 1 > 1 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv

ConTeXt  ver: 2016.03.13 23:40 MKIV beta  fmt: 2016.3.23  int: english/english

system          > 'cont-new.mkiv' loaded
open source     > 2 > 2 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv
close source    > 2 > 2 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv
system          > files > jobname 'context_cjk', input './context_cjk', result 'context_cjk'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > 2 > 3 > /home/icubic/download/wim/context_cjk.tex
fonts           > otf loading > loading '/opt/context/tex/texmf/fonts/truetype/public/dejavu/DejaVuSerif.ttf', hash 'dejavuserif'
otf reader      > found cmaps:
otf reader      >   platform 0: unicode
otf reader      >     encoding 3: unicode 2.0 bmp
otf reader      >       formats: 4
otf reader      >     encoding 4: unicode 2.0 full (unsupported)
otf reader      >       formats: 12 (unsupported)
otf reader      >   platform 1: macintosh (unsupported)
otf reader      >     encoding 0: roman (unsupported)
otf reader      >       formats: 6 (unsupported)
otf reader      >   platform 3: windows
otf reader      >     encoding 1: unicode bmp
otf reader      >       formats: 4
otf reader      >     encoding 10: unicode ucs-4
otf reader      >       formats: 12
otf reader      > cmap checked: platform 3 (windows), encoding 1 (unicode bmp), format 4, new unicodes 3329
otf reader      > cmap checked: platform 3 (windows), encoding 10 (unicode ucs-4), format 12, new unicodes 55
otf reader      > cmap checked: platform 0 (unicode), encoding 3 (unicode 2.0 bmp), format 4, new unicodes 0
otf reader      > ignoring global kern table using gpos kern feature
otf reader      > not unicoded: brailledot dlLtcaron
otf reader      > 2809 bogus names removed (verbose unicode)
otf reader      > 3357 base class tags removed (default is base)
fonts           > otf loading > loading done
fonts           > otf loading > saving '/opt/context/tex/texmf/fonts/truetype/public/dejavu/DejaVuSerif.ttf' in cache
system          > lua > compiling '/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/otl/dejavuserif.tma' into '/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/otl/dejavuserif.tmc'
system          > lua > dumping '/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/otl/dejavuserif.tma' into '/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/otl/dejavuserif.tmc' stripped
fonts           > otf loading > loading, optimizing, packing and caching time 0.134
fonts           > defining > font with asked name 'mainface-rm--fallback-1' is not found using lookup 'file'
fonts           > defining > unknown font 'mainface-rm--fallback-1', loading aborted
fonts           > defining > unable to define 'mainface-rm--fallback-1' as 'dummy--0'
fonts           > defining > font with asked name 'mainface-rm--fallback-1' is not found using lookup 'file'
fonts           > defining > unknown font 'mainface-rm--fallback-1', loading aborted
fonts           > defining > unable to define 'mainface-rm--fallback-1' as 'dummy--0'
====


On Wed, Dec 6, 2017 at 12:00 PM, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

6. Dezember 2017 um 00:32
The thing here is, I am not an ConText expert just an user. I am working on a manual (200+ pages) where including code snippets
is just a small part of the document and not something isolated. Not sure what to do next as the wiki explains a lot 
but not this. 

You need fonts [1-3]  which contains hangul characters (don’t forget to set a math font because it is used for the symbols in enumerations) and you have to enable linebreaking for korean with the \setscript command.

%%%% begin example
\definefallbackfamily [mainface] [rm] [Nanum Myeongjo] [preset=range:korean]
\definefontfamily     [mainface] [rm] [DejaVu Serif]

\definefallbackfamily [mainface] [ss] [Nanum Gothic] [preset=range:korean]
\definefontfamily     [mainface] [ss] [DejaVu Sans]

\definefallbackfamily [mainface] [tt] [Nanum Gothic Coding] [features=none,preset=range:korean]
\definefontfamily     [mainface] [tt] [DejaVu Sans Mono] [features=none]

\definefontfamily     [mainface] [mm] [DejaVu Math]

\setupbodyfont[mainface]

\setscript[hangul]

\starttext

이 FAQ 은 자주 반복되는 질문과 그에 대한 대답을 간단명료한 양식으로
모아 엮어졌습니다.

{\ss 이 FAQ 은 자주 반복되는 질문과 그에 대한 대답을 간단명료한 양식으로
모아 엮어졌습니다.}

\starttyping
이 FAQ 은 자주 반복되는 질문과 그에 대한 대답을 간단명료한 양식으로
모아 엮어졌습니다.
\stoptyping

\stoptext
%%%% end example

[1] https://www.freekoreanfont.com/nanum-myeongjo-free-download/
[2] https://www.freekoreanfont.com/nanum-gothic-free-download/
[3] https://www.freekoreanfont.com/nanum-gothic-coding-free-download/

Wolfgang

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