I have interested in developing DSLs using MPS since mid. 2010's, and tried a couple of times for toy-sized samples.
But I found that I could not use Korean characters in language concepts, constants in editor aspect and model instances in model editor which I defined. Even the Korean characters typed in the editor disappeared when any next character was typed in.
I think anyone who has its own alphabet other than roman characters wants to use it in DSLs and models. And I believe that the possibility of using its own characters is proper reason to develop DSLs for several purposes and users.
Maybe I don't know the ways to use Korean although the MPS already has options. If then, let me know please.
If not, can you make it possible to use Korean charactres in MPS in future edition?