"The Great King, Sejong" is a full-scale political drama describing how King Sejong and his loyal retainers cooperate and contrive to make his dynasty a better place. While King Sejong was on the throne, the Joseon Dynasty enjoyed increasing prosperity. The drama shows the dramatic processes of how so many new cultural heritages have been devised.

Kim Sang-kyungas King Sejong the Great
Kim Yeong-cheolas King Taejong
Kim Kap-sooas Prime Minister Hwang Hui
Lee Won-jongas Yun Hee
Lee Chun-heeas Jang Yeong-sil
Seo Jun-youngas Grand Prince Suyang
Oh Yeon-seoas Eori
Lee Hyun-wooas Prince Choong-nyeong
Nam Ji-hyunas young Princess Shim
Lee Inas Prince Yangnyeong (young)