During the reign of King Sejong in the 15th century, the Joseon Dynasty was the embodiment of the perfect state. To the Ming China, the aspiring imperial power, Joseon presented an obstacle to territorial expansion. To protect themselves from war, King Sejong develops a secret weapon to defend their territory and take back their land and supremacy.
Seol-joo
Hong-ri
Chang-gang
King Se-jong
Sa Ma-seon
Kkya Oh-ryung
Hong-man
In-ha
Bang-ok
Crown Prince
Geum-oh
Emperor
Jin Dae-in
Oh Cho's wife
Mu-saeng
Yu-bong
Oh Cho
Pan-soo
Bong-gu
Mal
Mao
Jeong
Ming
Mankang
Gasong
Chungwang
Sachan
Chief State Councillor
Lee Taerang
Researcher
Researcher