Career
He was also diplomat and ambassador, representing Joseon interests in a diplomatic mission to the Ashikaga shogunate in Japan. King Sejong dispatched a diplomatic mission to Japan in 1424. This embassy to court of Ashikaga Yoshinori was led by Pak An-sin.
The delegation from the Joseon court traveled to Kyoto in response to a message sent by the Japanese shogun;
The Japanese hosts may have construed these mission as tending to confirm a Japanocentric world order.
Pak An-sin and his delegation were more narrowly focused in negotiating protocols for Joseon-Japan diplomatic relations.