Dark Nuns

Sister Junia, a nun known for her strict faith and experience with spiritual crises, becomes involved in the case of Hee-joon, a young boy who exhibits signs of severe demonic possession. The Church initially delays intervention, questioning the nature of the possession and the risks involved. As the Hee-joon's condition worsens, Sister Junia takes responsibility for overseeing his care.

She is joined by Sister Michaela, a younger nun who is more pragmatic and skeptical of supernatural explanations. Despite their differences, the two work together to investigate the source of the possession. Their inquiry leads them to uncover suppressed records of previous exorcisms and forbidden rituals that were deliberately hidden by Church authorities.

As unauthorized rites are performed, the entity possessing Hee-joon grows increasingly violent, placing both nuns in danger. The case forces them to confront their personal doubts, guilt, and the limits of their faith. The situation escalates into a final confrontation in which sacrifice becomes unavoidable, and the boundaries between faith, sin, and redemption are tested.