Don't gun abd Gija are part of the founding myths of Gojoseon,and from archeological research results an ancient state called Gojoseon is estimated to have been established around the 5th century BC.Yin dynasty is supposed to have fallen in the 11th
century BC.(around 1046 BC) in chinese history.It dose not seem probable for a dynasty called Gija joseon to have exited in this period. But Gojoseon experienced an influx of the people of yan from the periphery of the liaodong region of china's northern borders when the unified dynasty of Han was established in 202 BC in continuation of Qin dynasty.Wimen a leader of yan, chased king jun of Gojoseon out of the throne in 194 BC.This is so-called wissi