PLZ.....Help me guys..
First of all, uninstall it with the uninstaller.
- Install the ENGLISH version.
- Change the language in the CC app to Korean.
- Install the Korean version. (DON't uninstall the English version)
- Change back the langauge in the CC app to English.
When your OS is running in English, InDesign will run in English with Korean functionality added, if your OS is running in Korean it will take the Korean User Interface, so let your OS run in English.
Every installer language will add needed plugins for the work with that language. E.g. If I install Hebrew, I get RTL functionality in German version, only if I would change the OS language it would change the language of InDesign, InDesign takes always as UI language the language of the OS if available, if not (in your case you have uninstalled English before), it takes any version which is available in the order of languages specified in the OS.
If you need to run your program in a different language than the OS but you have installed it in the language of the OS it becomes more difficult. You would have to use some system tools which are able to force a program to open with a different language. Most of those tools are freeware.