I don’t believe Unreal Engine has support for Asian language IME’s yet. Korean letters show up correctly because of your native computer’s IME, but to make it show up in your game on the screen, another IME by Unreal would have to be present. Unreal would rather have you put the Korean letters and words in a Text file/data table and reference those words. There seems to be issue with Asian characters and C++ language due to the characters and the c++ compiler. Let me know if you’ve been able to solve your problem, I’m having the same issue. I don’t know what your gaming needs are, but Unity seems to have support on other languages: Unity - Manual: IME in Unity