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 31 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. Written by Anonymous

Amid national chaos and fear for his life, tyrannical King Gwanghae orders his trusted councilor Heo Kyun to find a royal body double. He hires Ha-seon, a peasant mimic who bears a perfect resemblance to the King. When King Gwanghae collapses from a mysterious poison, Ha-seon reluctantly becomes a King. He must follow his conscience to save his country from collapse, avoid assassination, and pull off the biggest masquerade in history. K Written by CJ Entertainment

1592 – Joseon: In those days, it was common for the rich to hire the poor to do their hard and dangerous mandatory military duties. They were called ‘proxy soldiers’. A veteran proxy soldier TOW and his comrades are deployed to the south, where the Japanese has invaded. The King of Joseon has decided to seek asylum in China, and as he flees, he orders his young son –18-year-old Prince GWANGHAE– to take over the country’s military command. Vulnerable Gwanghae is devastated, but with Tow’s help, he is ready to fight in that harsh reality.

Dong-Ho, a singer of pansori, travels the country in search of Song-hwa, a fellow orphan who also studied under the same strict master.