The Divine Weapon 2008 (South Korea), also known as Singijeon is South Korea drama premiere on Sep 4, 2008
1448, the 30th year of Sejong's reign. The Ming dynasty's meddling into Joseon's domestic affairs goes to extremes and Sejong secretly plans to develop Singijeon, a rocket weapon upgraded from Goryeo's firearms technology. The Ming finds out and quickly dispatches assassins to attack the research lab, but CHOI Hae-san, the man in charge of the project, destroys himself along with the research materials to protect the weapon's secret. His daughter Hong-li barely escapes but loses the Chong-tong Records (Singijeon's blueprints) to the Ming assassins.
As the Ming's diplomatic pressure increases on Joseon for making the Singijeon, Sejong commands Chang-gang, the chief royal guard warrior, to take the only person with the potential to complete the Singijeon, Hong-li, safely to Sul-ju, a peddler. The son of the top engineer of Hwa-tong-do-gam (place for making gunpowder and firearms-or a weapons factory in today's language) at the end of Goryeo dynasty, Sul-ju is an exceedingly intelligent man with the top martial art skills in Joseon. He rejects Joseon as a descendant of Goryeo migrants and lives as the head of a merchant gang. He refuses Chang-gang's command to help construct the Singijeon, but in order to save his gang from a fight with rivals, he is forced to join Hong-li in seeing the Singijeon completed.
Desperate to understand the facts of Singijeon, the Ming sends an army disguised as a large envoy to intimidate Sejong and the court. Meanwhile, the Ming army sets out to find Sul-ju's headquarters and completely destroy the slightest possibilities of developing Singijeon. After repeated failures in the project, Sul-ju risks his life to recover the Chong-tong Records for Hong-li. However, he starts to have second thoughts as his comrades are sacrificed in battles. At last, as they are moments away from the completion of Singijeon, the Ming and Yeo-jin alliance army of 100,000 heads for Eui-ju, Joseon. In order to stop the war, Sejong hands Hong-li and the Chong-tong Records to the Ming envoy and even Sul-ju is imprisoned by the court.