When salary man Jun gets home, he finds his wife bleeding from her mouth and lying on the floor. He is shocked by the scene, but it turns out the blood is just ketchup and she is pretending to be dead. Without telling him why, she pretends to be dead everyday. Jun is dumbfounded by his wife’s behavior, but he begins to feel uneasy with her.

The film mainly follows the famous 1597 Battle of Myeongryang during the Japanese invasion of Korea (1592-1598), where the iconic Joseon admiral Yi Sun-sin managed to destroy a total of 133 Japanese warships with only 13 ships remaining in his command. The battle, which took place in the Myeongryang Strait off the southwest coast of the Korean Peninsula, is considered one of the greatest victories of Yi.