Notepad++ is very good software!
But this has Korean language input problum.
Please help Korean.
Could you give more description ?
I have the same problem with Tamil Language. I use a software called e-Kalappai for Input of Tamil Language Unicode characters. You can download e-kalappai from http://www.kinniya.net/downloads.htm
Notepad++ could not even do what Notepad could do in this regard (i.e. I can input Tamil Characters in Notepad without any problems, but not on Notepad++).