The series stars Shin Se-kyung in the title role alongside Nam Joo-hyuk, Lim Ju-hwan, Krystal Jung and Gong Myung.

[2][3] When the god of the Land of Water, Lord Ha-baek (Nam Joo-hyuk) visits earth to retrieve the sacred stones needed for him to claim the throne of the Divine Realm.

He seeks out the help of neuropsychiatrist So-ah (Shin Se-Kyung), the only remaining descendant from a middle-class family fated to serve him for generations.

[4][5] First announced in 2015, the live action version of the manhwa was written by Jung Yoon-jung, writer of the dramas Arang and the Magistrate (2012), Monstar (2013) and Misaeng (2014).

[9] The first script reading took place on March 16, 2017 in Sangam-dong, Seoul, South Korea,[10] with principal photography beginning the same month.