Jang Youngsil: The Greatest Scientist of Joseon (English title) / Jang Yeong-Sil
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.