If the person who created the channel used UTF-8 characters in the channel name, then mIRC will support it.
If the person who created the channel used code page 949 (Unified Hangeul Code) or EUC-KR (Wansung) encoded characters in the channel name, then mIRC will not be able to /join that channel as typed. mIRC converts the displayed characters into UTF-8 and sends non-corresponding bytes in its JOIN request to the server -- which isn't expecting UTF-8.
It is suggested you ask the channel operators to close their channel and create a new channel using UTF-8 encoded characters instead.
YEAY 2000th POST!
