Dark Nuns (2025)

Hee Joon gets possessed by an evil spirit. Sister Junia takes it upon herself to save the boy aided along the way by Sister Michaela who decides to help her even though chaos surrounds them. Father Paolo, a psychiatrist, believes that he can cure Hee Joon with medical intervention meanwhile Father Andrea performs exorcisms on the boy. (Source: paleplum at MyDramaList)