Screenwriter Kim Eun-hee began thinking about the story behind the series in 2011, wanting to reflect the fears and anxiety of modern times through the lens of the historical Joseon period. Originally, the creator thought it would be difficult to portray the story in a television series format, and instead created the webcomic The Kingdom of the Gods alongside illustrator Yang Kyung-il in 2014. While the series is adapted from the webcomic, they do not share much commonality other than their basic concepts.
