This drama will draw a real picture of the Joseon society, which was not well acquainted with the international situation at the time, in a bid to learn a lesson from this example.In East Asia at the time, Ming was losing his influence gradually, while Yojin was emerging as the central power in Manchuria. In Japan, Nobunaga Oda died after putting an end to a 120-year civil war, and Hideyoshi Toyotomi took power and unified the entire Japan. During the civil war, Japan accepted the Western civilization and came in contact with quite a new weapon, harquebuses. Records have it that the military capabilities of Japan at the time were stronger than those of the European countries combined. Japan had the high ambition to conquer East Asia based on such military capabilities. Regrettably, there were not many people in Joseon who had a correct understanding of the international situation.The drama will point out, first of all, these points as the primary causes of the 7-year Joseon-Japanese War and the ensuing bitter defeat. We are going to look into the life of Yi Sun-shin, Yu Seong-ryong and Won Gyun who went through such turbulent days as contemporaries. From this history, we are going to learn a lesson for today’s Korea, a small and weak nation in the dynamics of the international relations.