Around 18~17C BC, the center of Eastern Civilization temporarily moved into the southern Hebei province and the northern Henan province in the northern side of the Hwang He river, Parhae. This fact shows not only the movement of oracle bones & the bronze ware cultures into the southwest from the northern Parhae, but also the common aspects in many cultural factors in the both areas. In addition, it is believed that there are frequent folk movements between the areas in light of the formation of ethnic group. The Yin people--originally as the Dongi people--have its origin from the northern Parhae.
After the collapse of the Yin Dynasty by King Wu of Zhou, some of the Yin people was forced to move into near the Dalinghe river in the northern Parhae by Zhou. That place is where the Yin people originally lived, and the Yin people, led by Giza, came back to the place where their ancestor lived.
The present writer presumes that in the basin of Dalinghe, Parhae, around this time "the collapse of the Yin & the rise of the Zhou" (12~11C BC), Gijachoson established by the Yin people led by a royalty, Giza, who was forced to leave for somewhere else by Zhou.
Since then, the bronze ware culture which replaced the Lower Xiajiatian culture in the basin of the Dalinghe at a time when the Yin collapsed and the Zhou rose. But the bronze ware culture contains some cultural factors of the Lower Xiajiatian culture, and created so called the Namsankun culture. The Namsankun culture was named after a vestige site at Namsankun, Ningcheng, Liaoning province. It is understood that the culture was mostly developed around in 9~7C BC. The Namsankun culture has been transformed into a very unique style with a regional feature by accepting bronze ware style and production technique. The culture's regional feature is notable especially in bronze ritual vessels. By developing a new design, the Namsankun culture has its unique bronze ware culture, and a case in point is the Lute-Shaped Dagger. The main feature of the Namsankun culture is that these bronze weapons are mostly excavated at rock tombs.
During the Warring States period (Han, Cho, Wi, Yon, and Chungsan; 323 BC) each country’s leader claim themselves as a King, and also Chosonhu claims himself as a King of Gijachoson and “raised troops to attack Yon”. In 300 BC, however, when King Sowang of Yon with the help of its general Chinkai conquered the east so that Gijachoson’s main power was forced to leave toward the Yodong peninsula & northwestern Han Choson peninsula about 488 miles (or 244 miles) away from the Dalinghe basin.
Since Gija’s movement toward the Dalinghe basin around 12~11C BC, Gijachoson has been succeeded for almost 1,000 years to many kings including King Jun of Choson (2C BC). Hamheja said “Gija came Choson with 5,000 chinese”. According to “Wiyak,” it says “By 20 years of Jun’s acceding to the throne, due to Chinhan’s rise, the entire world enters into wild times. Therefore, peoples of Yon, Che, and Cho fled to Jun in order to avoid worry and suffering. Furthermore, there are many facts showing frequent movements toward the east (Kochoson) during the time of huge wars of Chinhan period.