In the early 15SUPth/SUP century, the worsened relationship between Joseon and Ming led to severely limited general exchanges. Minor disagreements could have quite possibly led to full blown military conflicts in such atmosphere. Intelligence exchanges were also out of the question. Gathering information regarding each other was more than difficult.BR General exchanges between Joseon and Ming only increased in the reign of King Taejong, and it was this time when both parties began to exchange information with each other. Both parties expanded their administrative and intelligence exchanges especially through the Liaodung Dosa(遼東都司) office. During the reign of King Sejong, Liaodung region became the essential base for intelligence exchange between the two dynasties. Whenever they had to commune with each other rather quickly, they contacted the Liaodung Dosa office first and sent relevant information over to them. Then intelligence gathered by the Dosa office would be relayed to the other side’s government, through proper channels.BR Joseon and Ming continued to collide with each other as they saw fit, but they also continued to expand exchanges, and the manners of such exchanges continued to diversify as well. Either continuous or prolonged conflicts would have only been detrimental to the interests of both countries. Intelligence gathering of the premodern era had to depend upon human resources, and in order for the government to use human resources, a region for them to operate was more than necessary.