In 2017, Son Oh-Gong and Ma-Wang are in conflict with each other as they look for a true light in a dark world where evil thrives. Having made a contract with Seon-mi 25 years ago, entitling her to seek help from Son Oh-Gong whenever she calls him in exchange for letting him free, the two meet again in a fateful encounter.

From there, Son Oh-Gong is bound to his protective role towards Seon-mi, the little girl he had met years ago.