Admiral Yi Sun-sin was a Korean naval commander during the late 16th century, known for his leadership in the Imjin War against Japanese invasions. He is celebrated for his innovative tactics and the development of the turtle ship, an armored warship that played a crucial role in naval battles. Despite facing overwhelming odds, Admiral Yi achieved numerous victories, including the famous Battle of Myeongnyang, where his smaller fleet defeated a much larger Japanese force. His strategic brilliance and unwavering dedication to his country have made him a national hero in South Korea and a symbol of resistance and patriotism.