I created a new blog for exchange letters among Lilian, me and our upcoming baby. I tried to use big5 charset for this blog but it seems that it will conflict with the php code. UTF-8 was finally chosen. Everything seems working now GUI-wide. However, when I tried to backup backend MySQL database, all the chinese characters are stored as "unicode" and when you export them, it just looks like arbitrary characters. I would have to figure out how to backup those data.