End of the Han dynasty
The end of the Han dynasty refers to the period of Chinese history from 189 to 220 AD, which roughly coincides with the tumultuous reign of the Han dynasty's last ruler, Emperor Xian. During this period, the country was thrown into turmoil by the Yellow Turban Rebellion (184–205). Meanwhile, the Han Empire's institutions were destroyed by the warlord Dong Zhuo, and fractured into regional regimes ruled by various warlords, some of whom were nobles and officials of the Han imperial court. Eventually, one of those warlords, Cao Cao, was able to gradually reunify the empire, ostensibly under Emperor Xian's rule, but the empire was actually controlled by Cao Cao himself. Cao Cao's efforts to completely reunite the Han empire were rebuffed at the Battle of Red Cliffs in 208 / 209, when his armies were defeated by the allied forces of Sun Quan and Liu Bei. The Han dynasty formally ended in 220 when Cao Cao's son and heir, Cao Pi, pressured Emperor Xian into abdicating in his favour. Cao Pi became the emperor of a new state, Cao Wei. A year later, in response to Cao Pi's usurpation of the Han throne, Liu Bei declared himself emperor of Shu Han; and in 229, Sun Quan followed suit, declaring himself emperor of Eastern Wu. The period from Emperor Xian's abdication in 220 to the partial reunification of China under the Jin dynasty in 265 was known as the Three Kingdoms era in Chinese history.
Han Eum
Han Eum () also known as Han Do () was one of the four members (No In, Han Eum, Sam and Wang Gyeop) who operated the government of Wiman Joseon. His position was a chancellor. Since Han Eum had a family name, Han, it is believed that he was an exile from China or person related to China. Just like his master Ugeo who was the last king of Wiman Joseon.　In BC 109 to 108, when Han dynasty attacked Wiman Joseon, he was surrendered instantly together with those exiles from China, No In and Wang Gyeop, while leaving the King of Wiman Joseon Ugeo. After his surrender, Han dynasty nominated him as a peerage of Jeok ja (Hangul:적자 Hanja:荻苴). He died after 19 years without a successor.