As for where Japan comes from, I don’t know.
I do know the words. . Below
The ancient Japanese only had their own language, but no writing. At one time they expressed their language entirely with the help of Chinese characters. During the long-term friendly exchanges between China and Japan, the Japanese gradually formed their own national script based on Chinese characters. It has always been recognized that Japanese characters originated from Chinese characters, but when were Chinese characters introduced to Japan? When did the Japanese learn to use words? For a long time, there have been different opinions and there has been no final conclusion.
Concerning the above issues, there are generally the following opinions.
Mid-first century theory, some scholars believe that the Japanese began to use writing in the middle of the first century or no later than the second half of the first century. They mainly based on the ancient Chinese book "Hanshu Geography" written at the end of the first century AD: "There are Japanese people in the Lelang Sea, divided into more than a hundred countries, and they come with offerings every year." According to this record, it can be seen that before the end of the first century AD , the Japanese have been to China and may have come into contact with Chinese characters. "Book of the Later Han Dynasty: Japanese Biography" also states that "in the first year of Jianwu Zhongyuan, the Japanese slave country paid tribute and congratulated them, making people call themselves doctors." This shows that Japan Not only can he speak Chinese, but he is also very familiar with the etiquette of Chinese ministers. This statement is not accepted by everyone. Therefore, some people put forward the theory that it was around the third century AD. According to the "Wei Zhi Han Zhuan" written by Chen Shou of the Jin Dynasty in China, writing was already in use in the Chen Dynasty on the Korean Peninsula near the Japanese archipelago in the third century AD, so it is possible that writing was introduced to Japan through the Chen Dynasty. The third theory is that the use of writing in Japan should be in the second half of the fourth century AD. People who hold this view believe that Japanese writing was first introduced from Baekje, and the Yamato court conquered Yamatai Kingdom and ruled Kitakyushu in the early fourth century AD. Therefore, exchanges with Baekje Kingdom on the Korean Peninsula were first introduced in the fourth century AD. In the second half of the 19th century, Japan had writing. It should also be after this. The fourth theory is that Chinese characters were introduced to Japan in the early fifth century. The main historical materials are the records in "Kojiki Yingshenki". The book records that a man named He Erjishi came to Japan with "The Analects of Confucius" and "The Thousand-Character Classic". Most people are skeptical of this statement.
The above statements have their own basis, but they also have their own weaknesses, and it is impossible to draw a convincing conclusion at the moment.