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.

Taejo, personal name Yi Sŏng-gye, later Yi Tan, was the founder and first monarch of the Joseon dynasty of Korea. After overthrowing the Goryeo dynasty, he ascended to the throne in 1392 and abdicated six years later during a strife between his sons. He was honored as Emperor Go following the establishment of the Korean Empire.