Een beroemde generaal die Japanse indringers versloeg met 's werelds eerste ijzeren schip, 'Turtle battleship' tijdens de Chosun-dynastie, werd door veel gemene volgelingen geïntrigeerd. Zelfs toen hij tot een veel lagere rang werd teruggebracht, diende hij in de oorlog en maakte hij zich zorgen over het welzijn van de natie. Deze film toont generaal Lee Sun-Shin, waarschijnlijk de beroemdste generaal in de Koreaanse geschiedenis, gebaseerd op zijn 'Wartime Diary'.

A famous general who defeated Japanese invaders with the world's first iron ship, 'Turtle battleship' during Chosun dynasty, was intrigued against by many villainous retainers. Even when he was reduced to a much lower rank, he served in the war worrying about the nation's wellbeing. This film depicts General Lee Sun-Shin who is probably the most famous general in Korean history, based on his 'Wartime Diary.'

임진왜란으로 나라의 운명이 풍전등화가 되었을 때 세계에서 처음으로 철갑선인 거북선을 만들어 왜적을 무찌른 이순신 장군은 옳지 못한 자들의 모함으로 형벌을 받고서도 나라에 대한 걱정을 하여 의연히 백의종군을 하였으며 부하에게는 엄격하면서도 자유로워 백성들 이 믿고 따르던 장군이었다. 이러한 이순신 장군의 일대기를 난중일기를 바탕으로 그려냈다.