Border Defense Council of Joseon (Korean: 비변사; Hanja: 備邊司) is the supreme administrative organ since mid-Joseon whose other names were like Biguk or Joosa.
While several invasions had happened from the north and south during Seongjong, it became clear that it was insufficient to set up the platforms of the security only by the general officers.
The alternatives were allowing the higher military officers to participate in the process of establishing security maneuvers to meticulously keep a keen eye on the issues of the border.
As the incident broke out, Bibyeonsa, the Council gained its establishment whose role was just simple without any distinctive function - only for emergencies like exterior invasion.
The book 《Bibyeonsa Deungrok》 (비변사등록) has been conveying the records in terms of the critical articles and platforms confirmed by the Border Defense Council.