[citation needed] For the state to be able to contend with its contemporary Wiman Joseon and send embassies to the court of the Western Han dynasty, there was probably some level of stable central authority.

Some believe that Chinese mentions of Gaeguk or Gaemaguk (蓋馬國, literally means Kingdom of armored horses, located near Kaema Plateau) refers to Jin.

[citation needed] Goguryeo is said to have conquered "Gaemaguk" in 26 AD, but this may refer to a different tribe in northern Korea.

[7][8] While it is believed that Koreanic/proto-Koreanic and Japonic/proto-Japonic (i.e. Peninsular Japonic) co-existed in the southern Korean Peninsula for an extended period of time,[9][10][11] the establishment of Koreanic speakers and their assimilation of Japonic speakers may have played a role in a Yayoi migration to the Japanese archipelago, believed to have occurred between 1,000 BCE – 300 CE, which overlaps with the period in which Jin is attested.

This is because it is a natural historical common sense for the civilized northerners of the Chinese continent to deliver to the southerners of the Korean Peninsula.

However, it is pointed that there is a contradictory description occurring in the study of social differentiation in Bronze Age, in the S.Korean academic community.

[26] Contrary to the claim that the displaced people of Gojoseon founded Silla, few northern relics have been identified in the southern part of the peninsula.

In addition, for some time the leader of Mahan continued to call himself the "Jin king," asserting nominal overlordship over all of the Samhan tribes.