The Chosun dynasty developed a system to enrich and strengthen a country through employing officers both from civil and military service. This was the effort to develop the country through an objective examination called “KwaKeo." When the country was in danger by the Japanese, Yi Sun-sin who was one of the military service members, participated in sea combat and defeated the Japanese 10 times at sea. He saved the country from a dangerous situation.
Despite numerous academic studies about Yi, Sun-sin, there is not even one study about his academic record and promotion history. This paper tries to explore Yi, Sun-sin's success in military service examination and also compares Yi Sun-Sin with his colleague, Yi, Il.
This is dedicated to our present ROK army officers who are trying to overcome the barriers and unify the country in the current situation. Also, through Yi Sun-sin's life, this paper tries to make the officers realize how important military practice and training are.