When Sister Junia discovers that Hee-jun is possessed by a terrifying entity, she pleads with the church for help only to be met with doubt and inaction. Convinced that time is running out, she joins forces with a rogue nun to perform a forbidden exorcism, one that could cost them both their lives. As the ritual spirals into chaos, dark secrets emerge, and Sister Junia must confront the true nature of the evil she's facing.