The Imjin War reaches its seventh year in December of 1598. Admiral Yi Sun-shin learns that the Wa invaders in Joseon are preparing for a swift withdrawal following the deathbed orders of their leader Toyotomi Hideyoshi. Determined to destroy the enemy once and for all, Admiral Yi leads an allied fleet of Joseon and Ming ships to mount a blockade and annihilate the Wa army. However, once Ming commander Chen Lin is bribed into lifting the blockade, Wa lord Shimazu Yoshihiro and his Satsuma army sail to the Wa army’s rescue at Noryang Strait.

In 1592, during the Imjin War, Admiral Yi Sun-sin and his fleet confront the powerful Japanese navy at the Battle of Hansan Island. As the Korean forces face a crisis, Yi Sun-sin unleashes his secret weapon, the turtle ship, to turn the tide of the battle at sea.

In the 16th century, during the Imjin War, Admiral Yi Sun-sin of the Korean Navy leads a small fleet against the mighty Japanese navy in a historic battle that will determine the fate of the Joseon Dynasty.