I expected more from this movie, but I wasn't bitterly disappointed. The summary tells you essentially all you need to know about the plot of this movie which is that it's about a girl who gets stalked by a man after losing her phone.

Lee Na mi is a young woman who loses her phone on the bus while drunk after a night out. The opening of the movie establishes that Na Mi is a woman who's dependent on her phone-her world essentially revolves around the device so when she loses it and it's picked up by an unknown party, he gains access into her world.

I don't watch movies often because I feel like a lot of the time, more could have been told of the story but due to the 1.30-2hr time limit, often gets omitted. I felt like that was the case with this movie.

There wasn't enough focus on what was meant to be the main focus of the movie-his access into her phone. The killer's M.O is to gain access into his victims' phone and using that access, isolate them from the people in their lives and then kill them. However, the movie spends the bulk of its time having him watch her and take note of her relationships and plot his move. This would've been fine except it put all the focus on the killer and when you watch a thriller, I feel like a driving force behind the emotions of the viewers comes from the fear and distress of the targets/victims-not the methods of the killers/perps. We didn't get enough of Na Mi in distress and living in fear-there wasn't enough build up to how his access into her phone impacted her life, so it was a bit lackluster and made the whole "phone" part of the story unnecessary to me. It could've been omitted, and he could've just been someone who followed her home off the bus, and we'd have had the same result. If they had taken their time to not only show how he used his access to her phone to methodically ruin her life and isolate her from her loved ones but also how that impacted her by making her restless and living in a constant state of fear, distress and distrust and the feeling of endlessly being watched but never knowing who until the final showdown in the house-it would have been much better. What we got, however, was that everything happened too quick, and the movie was over-he blew up her job in one go and her relationship with her best. Her father being removed was a non-factor because she didn't even realize he was missing until the final showdown, and she figured out who he was like the same day he cut out her job and friend from her life. This could've been done better to make it a better thriller, but it was otherwise a fairly good movie.