Hi @ytzong, and welcome to Ghost's github repo.
Ghost currenty has plans to allow for internationalization (see https://trello.com/b/EceUgtCL/ghost-roadmap for further details). The problem with chinese characters I think is the encoding the database uses. Can you confirm what encoding your wordpress datase tables use? I think it's either Big5 or gb2312.
Ghost uses UTF-8 encoding, so representation of traditional or simplified chinese characters will be wrong.
Thanks again for the report.