how to display korean characters in BIRT Viewer?

Hello,

i want to display Korean characters that are retrieved from my DB in my BIRT viewer. these characters are displayed as garbage. do you know how can i make it work?
note that when i hard code Korean characters (like copy korean words from the internet and paste them in my rptdesign) they are properly displayed in my BIRT viewer. only retrieved values from the DB are not properly displayed.

any clue?

regards
Boulos