Dark Nuns

A boy named Hee-Joon (Moon Woo-Jin) becomes possessed by an evil spirit. People around him struggle to save him. Nun Yunia (Song Hye-Kyo) takes action to save the boy, who is overwhelmed by powerful pain and she never gives up on the boy. Nun Mikaela (Jeon Yeo-Bin) takes an interest in Nun Yunia's actions and decides to help her even though everything is in chaos around them. Priest Paul (Lee Jin-Uk), who is also a psychiatrist, believes that he can cure Hee-Joon with medical treatments. Priest Andrew (Heo Jun-Ho) performs an exorcism to expunge the evil spirit from the boy Hee-Joon.