Lee Jun-gi caught a cold during the making of Ep.17, which almost lead him to pass out.
It is loosely based on the comic strip Iljimae, published between 1975 and 1977, written by Ko Woo-young based on Chinese folklore from the Ming dynasty about a masked Robin Hood-esque character during the Joseon era.
Lee is the second Korean actor to play the hero following Jang Dong-gun in 1993 and followed by Jung Il-woo for MBC's The Return of Iljimae in 2009.
Is loosely based on the classic Chinese wuxia novel.