Recommend reading about Yi Sun Shin before watching this movie. It's relatively difficult to follow the first half of this movie if you don't know something about him. Do yourself a favor and wiki Yi sun shin. It will give a quick glimpse into the man and back drops of this conflict. All historical accounts indicate that one ship went against superior numbers and he won. There are a lot of dramatic interpretations, but you will experience general gist of how he exploited fear in his own men and Japanese navy which suffered heavy casualties by Yi over 6 years of war. One other note: Korean uses a flat bottom ship. Japanese uses more traditional design. Korean navy has zero turtle iron clad ship in this engagement. That should be enough to enjoy one of the best ancient naval battle captured by this movie.