Great King Sejong) is a 2008 South Korean historical television series depicting the life of the fourth monarch of Joseon, Sejong the Great (played by Kim Sang-kyung).

The series aired on KBS from January 5 to December 7, 2008, on Saturdays and Sundays at 21:30 for 86 episodes.

His early years were turbulent as Joseon faced political tensions from both within and abroad.

After his ascension to the throne, Chungyeong (now called King Sejong) stabilizes the newly born country and gives rise to a blooming culture.

In the process he invents Hangul, the Korean writing system.