Kuang,
Not sure what the issue is, however I have artists and track information in my MC music library that is Mandarin since at least MC14.
For example I have artist 齊豫 or Yu Chyi in english and album 齊豫英文個人聲音自傳-敢夢 in my library.
This is all supported by Unicode (UTF-16 in this case and not sure what code page - it is late) but does work.
MC handles it just fine, don't expect all DLNA devices to handle it though as I discovered and John Gateley some years ago from J River help prove.
You can certainly edit the tags if yadb does not provide correct information. I use Windows 7 x64 and Windows 2008 R2 as my main OS's but have just as much work with XP, Vista and OS X in the past. (All US versions, some with added input methods so it works with US keyboards)