Oh its miscommunication.
bellow your demo site
http://www.jqwidgets.com/jquery-widgets-demo/demos/jqxgrid/#demos/jqxgrid/spreadsheet.htm
anywhere in it, you type hangeul 부 or 우 or other char.
it display qㅜ or dㅜ.
In your example you load completly maded hangeul its fine.
if you type keyboard directly then hangeul character is cracked;
if you first click any cell, and enter input mode and type hangeul its ok.
when type keyboard directly in not editing mode, hangeul is cracked.
thank you for your rapid reply.
sorry for my poor english.
thank you.