One of the founding fathers of the Han Dynasty, one of the "three outstanding heroes of early han dynasty" (Sean, Han Xin, Xiao He). With outstanding ingenuity, he helped Liu Bang, the founder of the Han Dynasty, finally win the world in the Chu-Han dispute. After the job was done, Sean retired in time to avoid the fate of Han Xin and Peng Yue.

Sean was a counselor and minister in the late Qin and early Han dynasties. 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 six countries, linking Ying Bu and Peng Yue, and reusing Han Xin. He also advocated the pursuit of Xiang Yu and the annihilation of 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 died in the sixth year of Huidi, posthumous title Wenchenghou.

Sean's strategy of "gathering three kings first, then fighting the overlord" successfully helped Liu Bang defeat Xiang Yu, the strongest opponent in the Chu-Han War. Resourceful Sean made great contributions to the establishment of the Western Han Dynasty by Emperor Gaozu Liu Bang.