조선왕조실록
The movie depicts the three months before Choong-nyung (the future Sejong the Great) becomes king. The Annals of the Joseon Dynasty, which follows the history of the Joseon Dynasty between 1413 and 1865, leaves out records of this crucial period. While to future generations, King Sejong would stand as a legendary figure for his creation of the Korean alphabet and advancing the country’s scientific research and law, as Prince Choong-nyung he was known to be a bit of a reclusive bookworm.