In the 15th century, despite so many accomplishments he has made for the people, King Sejong, his biggest goal is still remaining; the invention of original letters that can be read and written by all the people. But courtiers who want to dominate the knowledge and the power, are against his will and discourage his belief. Frustrated King Sejong hears about a bonze Sinmi a phonogram expert, and secretly brings him in the palace.
Song Kang-ho
King Sejong
Park Hae-il
Monk Shin-mi
Jeon Mi-seon
Queen Soheon
Choi Deok-moon
Jung In-ji
Jung Hae-kyun
Go Yak-hae
Kim Jun-han
Crown Prince
Cha Rae-hyung
Sooyang Prince
Oh Hyeon-kyeong
Old monk
