Unlocked

A Korean thriller built on a lost phone. Na-mi drops her phone on a bus. The person who finds it does not give it back; he installs monitoring software before handing it over. From then on he watches her location, her messages, her calls and her camera. The tension rests on technical detail: app permissions, cloud backups, location history and the small pieces of information in social media posts. He uses these to enter her life step by step. The second line is a police officer investigating a separate murder case whose trail leads to his own son. The most uncomfortable thing is that what is shown is not fantasy: most of the methods in the film really are possible on a phone today. The source is Akira Shiga's novel. Chun Woo-hee plays Na-mi and Yim Si-wan the man who finds the phone. It was shown directly on a streaming service and reached the most-watched lists in many countries. A brisk example for anyone who likes thrillers built on technology. For a viewer looking for depth, the characters stay on the surface and the final section returns to the genre's familiar shape.