SQL Developer Unable to see Chinese characters embedded in Package

Dear sir,
Please kindly help.
I am running a DB with 'AMERICAN_AMERICA.UTF8'.
My local NLS_LANG for the Oracle Home (regedit) are also set as 'AMERICAN_AMERICA.UTF8'.
I am not quite sure what to set for the SQL Developer NLS_LAN (E.g. from Menu bar Tools > Preference, select Database > NLS_LANG item).
Problem:
In the SQL Developer, when I open the Package Browser and view my P/L Sql package content... the embedded Simplified Chinese are all scambled, and unreadable.
Note: when I do select statement, I am able to see the chinese data fine.
But not sure why the Packages are not able to be display correctly?!
Please kindly assist.

871693 wrote:
So I am able to display the data, but aren't able to view the P/L Sql package embedded chinese?!
How can I fix it? I'm not sure.
Does it has to do with my SQL Developer NLS_LANG?Problem/solution involves SQL Developer's "environment".
Which company makes your SQL Developer? Which version is it?
What is OS name & version?

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