Joseon missions to Japan represent a crucial aspect of the international relations of mutual Joseon-Japanese contacts and communication.[1] In sum, these serial diplomatic ventures illustrate the persistence of Joseon's kyorin (neighborly relations) diplomacy from 1392 to 1910.[citation needed]
The chronology of one side in a bilateral relationship stands on its own. This long-term, strategic policy contrasts with the sadae (serving the great) diplomacy which characterized the Joseon-Chinese relations in this same period.[2]
The unique nature of these bilateral diplomatic exchanges evolved from a conceptual framework developed by the Chinese. Gradually, the theoretical model would be modified. The changing model mirrors the evolution of a unique relationship between two neighboring states.[3] In the 20th century, Joseon's neighborly relations diplomacy failed.