Wiman Joseon 194–108 BC was the dynasty of Gojoseon. It began with Wiman Wei Man's seizure of the throne from Gojoseon's King Jun together with ended with the death of King Ugeo who was a grandson of Wiman. except archaeological data, the main mention on this historical period comes from chapter 115 of Sima Qian's Records of the Grand Historian. Wiman was originally a Chinese military leader from the Kingdom of Yan under the Han dynasty.
Wiman's grandson, King Ugeo 우거,右渠, permits many exiles from Han dynasty of China to constitute in Wiman Joseon. The number of Han grew, however, as well as King Ugeo prevented the Jin state from communicating with the Han dynasty. As a result, in 109 BC, the Emperor Wu of Han invaded Wiman Joseon nearly the Luan River. After failing several times to defeat Wiman Joseon's armies, Han Wudi tried to convince the princes of Wiman Joseon to kill King Ugeo. The conspiracy failed and it led to the harm of the Gojoseon kingdom. After the war, Wudi of Han dynasty sentenced two generals to death for failing to defeat Wiman Joseon.
After a year of battle, Wanggeom-seong was captured and Wiman Joseon was destroyed. The Han dynasty creation the Four Commanderies of Han in the captured areas, which corresponds to the current area of Liaodong peninsula and the northwestern Korean peninsula. The Commanderies eventually fell to the rising Goguryeo in 4th century AD.
Several nations were formed in its place. Among them was the Nangnang Nation. The Nangnang Nation must be differentiated from the Lelang commandery.