You are 100% incorrect. The original Tune basses were designed and made in Japan. In fact they still make them. Something happened where the partners split and they started making factory made Tune basses in Korea.There is still an ongoing copyright issue.
I have played both. The Korean are great basses. The japanese made basses definitely feel boutique.
Japanese basses
http://www.cc.rim.or.jp/~tune/index.html
Korean Basses
http://www.tuneguitars.com/main.php
100% correct. I've owned a Japanese TBC-5 Custom and it was one of the best basses I've ever played...