App the Horror. Genre: Horror, Thriller. Director: Hyung Seul-woo. Cast: Kim Young-jae, Kim Ju-a, Yang Jo-a, Kim Hee-jung, Park Seo-ji. Release Date: 2026-02-18. Runtime: 88 minutes. Rating: 5.0/10. When the app is launched, a ghost appears. Developed by four young adults, the app becomes the centerpiece of a livestream where they venture into a supposedly haunted mountain to prove its authenticity—only to meet a grim fate.

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