Did the Japanese come from the Tang Dynasty in China?

No, some Japanese are from Chinese mainland, but Bitang was earlier, and people crossed the sea into Japan in the pre-Qin period. One of the most famous records is Xu Fu, who sought immortality in the Qin Dynasty. In addition, the Japanese emissary came to China during the reign of Emperor Guangwu of the Eastern Han Dynasty and was given the title of "Slave Wang Yin" by Emperor Guangwu. In addition, some Japanese are of Malay descent, which shows that their ancestors were not pure Han nationality. Generally speaking, the communication between Chinese mainland and Japan began before the Qin Dynasty. Naturally, Bitang was much earlier.