Aspiring YouTuber Gi-ho stages a fake seance for viral content, but Ja-young joins, seeking her missing sister Seo-woo. In an underground cistern, Seo-woo volunteers as the "possessed," but when she collapses, terror unfolds. Trapped with sinister forces, the students face a deadly fate, leading to a shocking twist.
YERI
Ja-young
Lee Chan-hyeong
Dong-joon
Suh Dong-hyun
Gi-ho
Oh So-hyun
Ye-eun
Kim Eun-bi
Mi-yeon
Park Seo-yeon
Seo-woo
