It seems `ko_KR.utf8` works, try
LC_COLLATE=ko_KR.utf8 sort file
* * *
How have I found this?
for loc in $(locale -a);
do echo ____"${loc}"____; LC_COLLATE="$loc" sort file;
done | pcregrep -MC1 'wa\
Al (\
|[^_])*Günter Rohrbach\
G'