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.

A sweeping historical epic set in the late Three Kingdoms era, following Silla’s fierce battles against Goguryeo, Baekje, and Tang as its kings and generals fight to achieve the unification of the Korean Peninsula.