Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
조선시대에는 화선이 전투에서 중요한 역할을 했다.Joseonsidaeeun hwaseoni jeontueseo jungyohan yeoghal-eul haetda.In the Joseon Dynasty, fire ships played an important role in battles.