Regarding Yi Sun-sin..

During the Imjin War, Yi Sun-sin was just one of many incompetent generals of Joseon.
The stories about him winning naval battles and dying heroically make no sense.
The reason is....
There were 115 naval battles won during the Imjin War, and among them, the number of battles Yi Sun-sin participated in was
a mere 1 case, and even that single case wasn't a victory, but a retreat.
Then who led the remaining 114 victories? It was China (the Ming Dynasty).
In other words, history was distorted to make it seem as if Joseon won every naval battle by cleverly putting forward the figure of Yi Sun-sin to take credit for the naval battles won by China.