[1] Sean was a counsellor and minister in the late Qin Dynasty and early Han Dynasty. His ancestors lived in Korea for five generations. After Qin destroyed Korea, he attacked Qin Shihuang in Bolangsha and missed. When he fled to Xiapi, he met Huang Shigong and obtained the art of war, which was profound and resourceful. Liu Bang was the main "think tank" in the peasant war at the end of Qin Dynasty. In the Chu-Han War, he put forward some strategies, such as not establishing the descendants of the six countries, linking Ying Bu and Peng Yue, and reusing Han Xin, and advocated pursuing Xiang Yu and annihilating the Chu army, which laid a solid foundation for Liu Bang to complete the great cause of reunification. Liu Bang said that he was "strategizing and winning thousands of miles", which is also famous for Sean's witty planning and literary strategy. When the Han Dynasty was founded, it was named Liu Hou, but after that, it retired and remained immortal.

Sean has been sickly. Since Emperor Gaozu entered Guanzhong, the capital city, and the world was stable, he has been using the excuse of staying at home for illness. With the gradual stabilization of Liu Bang's throne, Sean followed the distributability principle and kept pace with the times, and gradually retired from "the emperor's teacher" to "the emperor's guest". Sean seldom participated in the planning of Liu Bang's cruel struggle to destroy the king with a different surname in the early Han Dynasty. In the infighting of the royal family in the Western Han Dynasty, Sean also adhered to the legacy of "no relatives and no relatives". In the tenth year of the Han Dynasty (BC 197), a new crisis appeared in the upper strata of the Han Dynasty. Liu bang has the intention of changing the prince. At that time, Liu Bang doted on Mrs. Qi, and found that she was unfaithful and showed signs of replacing Liu and Wang, so she wanted to abolish Prince Xiaohui (Lv Hou) and replace Mrs. Qi as the national reserve. The ministers in the ruling and opposition parties fought together, but they could not change Liu Bangchu's mind at all. Seeing that the Crown Prince was about to be deprived of power, Lv Hou turned to Sean, a "think tank". Sean, considering having a prince, is very important. It is impossible for him to stand up easily. Uncle Sun Tong, a great scholar, put it well: "Jun is the world, and this is the respect of Sean."

Shook the world. "Plus, at that time, the world was set, the foundation of the Han Dynasty was not yet solid, and various systems were still being improved. Only by being content with the status quo and doing nothing can we stabilize the world and protect the country. Based on this overall situation, Zhang Liangsui said to him: It is difficult to protect the prince, and "being good and being expensive" (Hao: white, that is, four old people with white hair, that is, Mr. Dong, Mr. Jiao Lizhong and Qi He) are all over 80 years old, and they are noble in benevolence and righteousness. If they don't just become titles in the Han dynasty, they will disappear into the mountains, but the emperor can't hire them, but they are still benevolent and noble. If the prince condescends to ask the Four Nobles to come out of the mountain and go in and out of the palace with them, the emperor will ask clearly, and when he knows it, the position of the prince can be decided. As Zhang said, Liu Bang asked the "Four Nobles" who accompanied the prince to be a hermit he had never invited. Now that he is beside the prince, it can be seen that the prince is full-fledged and hard-winged, and there is nothing he can do. From now on, he will never talk about Prince Yi Li again. The prince finally succeeded to the throne, so Lv Hou respected Sean. There are few records in Historical Records and Hanshu about Sean's help to Xiao He, but this does not harm Sean's later achievements. When the work was sealed, Emperor Gaozu Liu Bang ordered Sean to choose 30,000 households as food cities in Qi State. Zhang Liang resigned and humbly asked him to seal the place where he met Liu Bang (now Peixian County, Jiangsu Province). Liu Bang agreed, so he called Sean Liu Hou. The reason for Sean's resignation is that he was demoted to Buyi after the defeat of Han Dynasty, so he should be satisfied with Buyi winning thousands of households and ranking first. Seeing that the regime of the Han Dynasty was consolidated day by day, national affairs were planned, his political goal of "avenging Qiang Qin for Korea" and his personal goal of "sealing Wan Huhou" were also realized, and his lifelong dream was basically satisfied. Coupled with illness, frail, and witnessed the tragic ending of Peng Yue, Han Xin and other active ministers, Lenovo to Fan Li and Wen Wenxing either fled or died, and deeply realized that "a wily rabbit dies, a running dog cooks; Birds are exhausted, and good bows are hidden; The philosophy of "when the enemy is defeated, the adviser dies" is afraid of the loss of those with vested interests, and even more afraid that the fate of Han Xin and others will fall on him. Sean excused himself, abandoned everything in the world, devoted himself to monasticism, believed in the study of Huang Lao, lived a quiet life and became a fairy. However, Lv Hou thanked Sean and advised him not to suffer. Sean finally listened to this suggestion and remained convinced. Historical Records records the year of death as two years of high school, while Hanshu records it as six years (BC 189), which is doubtful here.