Tax

Hi!
I worked as a pavilion staff member performing non-commercial activities for six months in Osaka. This was a business trip from the head office in my country.
My total salary for the six months in Osaka was ¥1,680,000, which was transferred from the head office in my country.When I asked whether our staff are required to pay income tax in Japan, our manager from BIE / One Stop Shop confirmed that as per agreement between Government of Japan and BIE,non-commercial pavilion staff are exempt from all taxes, including income and special income taxes, in Japan.
However, I am still a bit confused and would like clarification.