Plz writing error

hi
When writing, you must write only in English.
If you write in Korean, you get an error.
I want to write in another language, where should I set it up?
plz…

It should be able to store content in Korean without problem. Did you check that the database that stores the content supports UTF-8?
See:

(normally UTF8 is enabled everywhere by default, I thought, but maybe I am mistaken here).