Choi Min-sik as Jang Yeong-sil

Han Suk-kyu as King Sejong

Shin Gu as Minister

Huh Joon-ho as Jo Mal-saeng

Kim Tae-woo as Jeong Nam-son

Kim Won-hae as Jo Sun-saeng

Im Won-hee as Im Hyo-don

Park Sung-hoon as Crown Prince Yi Hyang

Jeon Yeo-been as Sa-im

Yoon Je-moon as Choi Hyo-nam

Min Kyung-jin as Shin-gae

Lee Dong-yong as Yun Jung-bu

Kim Seung-hoon as Choi Man-ri

Kim Seung-tae as Choi Cheon-gu

Choi Jae-sup as Yun Sa-wung

Lee Seo-hwan as Eunuch Jeong

Ryu Ji-hoon as Jo Seo-gang

Bae Je-gi as King's Soldier

Hyun Bong-sik as Baek-ho

Kim Sung-kang as Oh Yang

Kim Tae-eung as Sergeant

Kim Hyeon-chang as Myung Envoy