Drama series follows the life Jang Yeong-Sil: a scientist, technician and inventor during the Joseon period. Jang Yeong-Sil was born in the lower class nobi. King Sejong notices his abilities and brings him to the palace. King Sejong grants him a chance to display his abilities. He invents tools like astronomical instruments, iron printing press and a water clock.
as Jang Yeong-Sil
as Princess Sohyun
as King Sejong
as King Taejong
as King Taejo
as Ha Yeon
as Hwang Hee
as Jo Gwang
as Choi Bok
as Maeng Sa-sung
as Jo Mal Saeng
as King Sejo
