Island Part 2(2022) contains evil fighting religious duo Van and Priest Johan who fight against evil spirits through exorcism and Christian interventions accompanied by Won Mi Ho.
It does have the same setting to that of Dark Nuns in the main characters fight against otherworldly forces and have integral roles rooted in their faith.

Island (2022) contains evil fighting religious duo Van and Priest Johan who fight against evil spirits through exorcism and Christian interventions accompanied by Won Mi Ho.
It does have the same setting to that of Dark Nuns in the main characters fight against otherworldly forces and have integral roles rooted in their faith.

Dark Nuns is supposed to be female centric spin off of The Priests.
The Priests involves a girl Young Sin getting possessed by malevolent spirit and Father Kim accompanied by Deacon Choi who stayed even after many of them ran away unable to cope with the intensity of the situation.
These to embark on a nerve racking journey to save the girl from the clutches of evil.
The premise of The Priests is supposed to very similar to Dark Nuns and its recommended to watch The Priests before Dark Nuns for a well rounded viewing experience.