I liked a lot this thriller about a woman stalked through her smartphone. It is clearly a creepy cautionary tale about the power that have smartphone upon the life of most people and how dangerous it is when somebody get a hold on your personal data and what you do on internet.

The premise is really interesting and I wish they would have taken the societal criticism even deeper. It remains pretty on surface of what it is trying to say about society as the scenario put the focus much more on the villain than on the social dynamics. I loved the pacing of the story in its first half, you can feel the anxiety crippling as the heroine gets deeper into the trap set for her. However, I think the second half of the story could have benefited from a better rhythm. It was thrilling but some actions taken by the characters lacked logic.

I found the acting solid: especially Yim Si Wan who does a really commendable job carrying the plot. I'm pretty sure that with a less gifted actor, the scenario would have felt much flatter. He brought a huge range of emotions to his part, making the character he played complex and multi-layered despite the scenario being quite open and vague regarding his motivations. It is my first time watching him in a main role and I will be for sure digging into his filmography for more. Similarly, I'm quite impressed by Chun Woo Hee acting. I thought she acted beyond what the scenario was offering her.

The production was good. I particularly enjoyed the opening sequence with the phone being the window into the life of the heroine. It was super efficient into conveying the point of the movie. The music did not left a lasting impression on me but was appropriate for the angsty thematic.

I would recommend this to people that are looking for a thriller supported by good acting. It is pretty horrific in some way as it is centered around a very prominent feature in most humans modern life: the smartphones. It is a quite violent movie, so be mindful if you have any trigger.