Actually,Japanese don't have same characters in appearance.It differs according to the different region and Chinese are more obvious. Korean's differences may be smaller in appearance.
NanYue is a district of Qin Dynasty and North Vietnam is a sub-district of NanYue.
And central suzerain would not support protection rather than claiming a war for not being paid tribute
I could say that Northern Han's footprints would be out of your imagination. Image that some ancient groups of Hans living in Southern Asia and Iran.
Even many acient arabican-looking humans living in the Sakhalin island and Hokkaido.
I have noticed that Vietnamese would always mentioned BaiYue,and what's your knowledge of that?You can share it with us.
I'd like to share some I have known.BaiYue can be separated into 2 Chinese words. Bai with 百 in Chinese means many or hundreds of,and Yue with 越 or 粤 has different...