Did Goguryeo, Baekje and Silla use the same word?

 Was it like the language of the Three Kingdoms? No one disputes that the language used in Pyeongan-do and the language used in Jeolla-do are the same language. Just as the language used by President Kim Dae Jung is Korean, the language used by General Secretary Kim Jong-il is Korean. So if a summit is held between the two, there is no need to worry about the money to be given to the interpreter. But what if such talks were held in ancient times? What if political talks were held between Yeon Gaesomun and Kim Chun-chu, or military talks were held between Gyebaek and Kim Yu-shin? Didn't I need an interpreter then? So, did the people of the three ancient countries speak the same language? The official position of the North Korean academic community is not only that the languages of the three countries were the same, but also that the same language was already used on the Korean Peninsula from the time of tribal countries. Their view is that the differences in language between tribal countries on the Korean Peninsula, which are pointed out in Chinese history books such as "The Three Kingdoms" and "Hu Han-seo," or the differences in the three languages revealed by the etymological interpretation of the proper nouns in "The Three Kingdoms." This view, which is generally accepted by scholars in the south, may be criticized for making mistakes in projecting the present into the past. Even if a single language is now used on the Korean Peninsula and has been the case since the Middle Ages, there is no law that it must have been the case in ancient times. Moreover, as in modern times, monolingual countries were rare in ancient times, and it is a very bold hypothesis to argue that the languages between countries were the same. More importantly, it is the logical ambiguity of scholars who support monolingualism. The linguistic boundary between "special dialect differences" and "individual languages" is very blurred between the linguistic differences between the southern and northern parts of the linguistic differences between "special dialects" and "individual languages." Therefore, political considerations often work there. South and North Korean scholars who say, "We will look into the problem later," reiterate that these languages are "not different languages" or "originally from one branch." However, "not a language of different descent" or "from one branch" is a fact that scholars who claim that the languages of the three countries were different. In other words, the same lineage does not mean that it is a single language. Modern Spanish (Castelliano) and Portuguese, for example, are clearly "one-pronged" and "same lineage" languages, but they are clearly different languages. Lee Ki-moon, one of the scholars claiming that the languages of the three countries were different, also says that the languages of Buyeo represented by Goguryeo and the limit represented by Silla must have been closely related. Lee Ki-moon, however, speculates that Goguryeo language was as close to ancient Japanese as Silla or Baekje. Among the opinions that the languages of the three countries, at least Goguryeo and Baekje-Silla, are different, are separated from the Korean Peninsula and belonged to the Tungus language (the Althai tribe distributed in eastern Siberia, Sakhalin, Manchuria, and Xinjiang). This view is generally argued by Japanese scholars and refuted by Korean scholars, but at least it is not groundless for the Goguryeo language before the south, that is, the Goguryeo language centered on South Manchuria. The Goguryeo dialects extracted from the names of the famous Goguryeo five tribes are constantly connected to the Tungus language. Whether the three languages are viewed as dialects of the same language or as separate languages of the same lineage, the three languages seem to have been quite different from each other. It is not known whether Pyongyang's Kim Chun-chu was so different that he needed an interpreter, but it is certain that Pyongyang's Kim Chun-chu felt a greater linguistic incompatibility than Seoul's Kim Jong-il. Naturally, Kim Chun-chu, who led the Tang topple Goguryeo, is not a "national traitor," contrary to the harsh evaluation of South and North Korean nationalists. Whether it was Tang or Goguryeo, they were both foreign powers for the Silla people. How can there be a "national traitor" before a single "national" is formed using a single "national language"? Although it's an article, the conclusion is that there is no historical evidence, and no one knows...