The storyline has a similar genre to Netflix's Unlocked movie, which is also about smartphone stalking, and the fear inducing hunting has almost the same level of terror as Tving's Midnight, a legendary Kmovie about stalking. Here the movie takes a more practical approach to the notorious tech crime. The plot is really innovative as it features the realistic modus operandi of the criminal, the pacing is great with nail biting suspense. Meanwhile for Shin Hye Sun headlining this movie, I knew she's gonna be great for this role and it really is, her acting performance is freaking insane. The ending is so crazily scary, I'm gonna get PTSD after watching it.