The Tsushima clan was appointed in charge of diplomacy with Korea by the Edo bakufu (Japanese feudal government headed by a shogun), and was also bestowed the exclusive right for commerce with Korea at the newly-established wakan in Busan.
対馬藩は江戸幕府から朝鮮外交担当を命じられ、釜山に新設された倭館における朝鮮交易の独占権も付与された。