Unlocked (2023) One Lost Phone, Endless Terror
In the fast-paced streets of Seoul, ordinary office worker Lee Na-mi (Chun Woo-hee) loses her smartphone after a night out with friends. What seems like a simple misfortune turns into a nightmare when the finder, Oh Jun-yeong (Yim Si-wan), secretly installs spyware before returning it.

Using every piece of personal data — locations, messages, finances, and social connections — Jun-yeong infiltrates Na-mi’s life, manipulating her relationships, career, and sanity with chilling precision. As her world crumbles, veteran detective Woo Ji-man (Kim Hee-won) investigates a series of brutal murders, slowly realizing the prime suspect may be closer to him than he ever imagined.

With standout supporting performances by Park Ho-san as Na-mi’s caring father Lee Seung-woo, Kim Ye-won as her loyal friend Jung Eun-joo, and Jeon Jin-oh as the determined missing persons team leader, Unlocked delivers relentless suspense and explores the terrifying vulnerability of our digital lives.
A smart, twisty psychological thriller that will make you think twice before picking up a lost phone. Directed by Kim Tae-joon in his feature debut.