"Emperor of the Sea" (Korean title: Haeshin) is a South Korean historical drama (sageuk) that originally aired in 2004–2005. The series centers on the life of Jang Bogo (also romanized as Jang Bo-go), a real historical figure who rose from humble origins to dominate maritime trade and naval power in the 9th-century Silla kingdom. The show blends political intrigue, revenge, commerce, and seafaring action across expansive production design and period detail.