Jang Yeong-sil (Korean: 장영실) is a 2016 South Korean historical drama television series starring Song Il-kook, Kim Yeong-cheol, Kim Sang-kyung and Park Sun-young.

It replaced The Jingbirok: A Memoir of Imjin War and aired on KBS1 from January 2, 2016 to March 26, 2016 on Saturdays and Sundays at 21:40 (KST) for 24 episodes.

A television series talk about Jang Yeong-sil, a popular scientist of Joseon in the 15th century.

Born as a slave but with the remarkable talent and the profound passion for astronomy, he was known by King Sejong and was recommended to the court.

Jang Yeong-sil had a lot of contributions for the science-technology of Joseon, he has left many great inventions such as the water clock, the sundial, the astronomical instruments, the rain gauge and also many research on weaponry.