Ha! At last i found unicode gdr myself. lol
Ok, for anyone who need it to upgrade your symbian phone supports asian characters, follow me. 
First, you need a file explorer or fileman app and font remover if you installed other font already.
Then, download these fonts files aka gdr…
11x12_latin.gdr
15x16_latin.gdr
Browsereur.gdr
Ceurope.gdr
Big or small font you like best, eh?
If you prefer small one, copy 11x12_latin.gdr font along with Browsereur.gdr and Ceurope.gdr, paste to your folder in c:\System\Fonts\
* 15x16_latin.gdr is for bigger font.
Create Fonts folder if you don’t have it yet.
Reboot your phone.
And.. Voila, you got it! 
Tested on Nokia 7610, I can’t guarantee a successful patch on other, though. Good luck.