When demonstrating the mistakes and harms of Qin's expulsion of Qin Keqing, this paper did not focus on the specific issues of expulsion, nor did it involve his personal sources of advance and retreat. But standing on the height of "crossing the sea to control the princes" to complete the great cause of unifying the world.

To analyze and clarify the advantages and disadvantages of expelling guests, which embodies Reese's excellent knowledge and his progressive political views and employment route in line with the historical trend. This article shows the idea of elite management regardless of region.

Extended data

Creative background:

According to Records of the Historian and Biography of Lisi, South Korea sent Zheng Guo, a water conservancy engineer, to lobby Ying Zheng, the king of Qin (later Qin Shihuang), and advocated digging ditches to irrigate the fields in an attempt to consume Qin's manpower and not attack South Korea, so as to implement the plan of "tiring Qin".

Reese is also among the deportees. Despite his sincere fears, before he left, he took the initiative to write a letter to persuade the king of Qin not to expel the guests, and wrote a book "Persuading to expel the guests", which has been circulated throughout the ages.