http://hkmdb.com/db/movies/images.mhtml ... ay_set=eng
(Movie was already created long ago with some Chinese cast / Crew members)
So it was billed as Chinese Movie in both German and English reviews its seems very likely nearly All-Korean Cast.
Still it can be useful to have those faces in case of watching some other co-operations, too..

I'm not sure and I not watched the movie but I think your Choe Jae-Ho could be wrong and that could be the real one:

http://hkmdb.com/db/movies/image_detail ... ay_set=eng

Come on Michel watch all his pics together the fat cheeks and his chin - isn't quite the same shape?