EO with Japanese value

I've a old app that Japanese localization is needed recently in addition to (the already working)English and Chinese localization features. For some attributes, say firstName in Entity Person, I have to add localization (sub)attributes such as firstName_CN, and firstName_JP for first name in Chinese and Japanese languages. Everything worked very well before Japanese is added:

Japanese first name string can be set at EO level ok. but after saveChanges(), the Person table's jp_first_name column get only junk of form '______'.  Consequently, the eo fetched from the database has all '____' kind of values where Japanese text supposed to appear.

This may not be an issue to WO5.3 (I'm not sure. Someone can tell me) but My old app is still 4.5.1 on win2k/MySQL. This is strange enough since I don't have problem for Chinese and even Japanese string web appearance and file I/O has no problem! So the only issues are related to database and communications between EOF and database.

Any clue on this? I need to identify the problem first:
(1) that version of EOF not fixable?
(2) database column string encoding issue?
(3) some special treatment at EOF level just for Japanese?

Thanks

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