Plot Turns and Climax: During the final act, Jung-won brings Eun-seo to Holy Night's designated ritual site. Sharon initiates a complex six-step exorcism ritual (Presence, Breakthrough, Identifier, Entrapment, Expulsion, and Closure).
As Sharon chants, the arch-demon Moloch/Lucifer's spirit retaliates, causing Eun-seo to levitate, speak in ancient tongues, and reveal the team's deepest past secrets. Simultaneously, the cult leader (Father Marco) leads waves of possessed cultists to storm the building and interrupt the ritual.
The Final Stand: Ba Woo fights through hall after hall of cult members, using his supernatural physical power to knock the demon-possessed thugs unconscious without killing the human hosts. When the cult leader attempts to stab Sharon, Ba Woo intercepts him. Ba Woo temporarily channels the demon's kinetic energy into his own fists, delivering an explosive final punch that breaks the demon's grip on Eun-seo. Sharon traps the demon's essence into her mystical brass mirror and seals it away forever.
Post-Credits / Sequel Tease: Eun-seo recovers and reunites with Jung-won. However, a post-credits scene reveals that the cult in Seoul was merely one cell of a global organization known as the 'Archbishop Lucifer Group'. The film ends with Holy Night packing their gear to head overseas for their next mission, teasing an expanded franchise.