Sql developer nls_lang setting?? US7ASCII problem

im using korean lang. oracle is 9i, sets US7ASCII charaterset
using sql developer, korean langs goes like this '-- ÀϺ° ÆǸŰèȹ Àç»ý¼º' or '������������������������������������������������'
so, how can i solve this problem...
i wanna use sql developer but, i can't cause its problem.
please help me...

First thing to check is the font you are using in SQLDeveloper you can check this in
Tools -> Preferences -> Code Editor -> FontsPick a unicode font to be sure.
If you still have problems then you may need to change the encoding of your database to UTF8 or similar, it's usually the case when you need non ASCII characters; in this case better ask your DBA for assistance, as changing encoding is not an easy task.

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