Choi leaves her husband in the car while she shops. A parasite infects him, causing chaos in the shopping center. Despite her husband attacking her, Choi saves a child and locks him away to protect others. In the present, Kang-woo and Su-in plan to expose the church's dangers. Kim, a police officer, learns about the monsters and investigates. The police discover body parts in a warehouse, suspecting the church pastor. Meanwhile, a detective secretly working for the parasites plots against Kang-woo. Tensions rise as the truth unfolds and betrayal looms.