Unlocked (2023 film)

Lee Na-mi is a young woman who primarily works as a marketer at a start-up company that sells jelly drinks, as well as a part-time job at her father's cafe. One night Na-mi leaves her smartphone on the bus, which is picked up by Oh Jun-yeong, who uses a fake voice app to arrange for Na-mi to pick up her phone at a repair shop the next day. At the repair shop, a masked Jun-yeong fixes Na-mi's broken phone screen and gets the password from her in order to install spyware on her phone and clone it.

Jun-yeong, who has done this before to eight victims, methodically follows Na-mi's daily activities to learn about her life. Using this information, he stages repeated meetings with Na-mi and befriends her. Na-mi's father, Lee Seung-woo, is suspicious of Jun-yeong, so Jun-yeong tricks his way into Seung-woo's house and keeps him prisoner so he cannot protect Na-mi.

Simultaneously, Detective Woo Ji-man investigates a murder case involving a dead body found on a remote mountain, and finds clues that implicate Jun-yeong, his son that he hasn't seen in ten years. Ji-man finds Jun-yeong's apartment with evidence of his activities, but Jun-yeong tricks him and is able to destroy the evidence. Seven additional bodies of Jun-Yeong's victims are found.

Jun-yeong uses Na-mi's social media to leak work information and badmouth her company, causing her to get fired. Na-mi and her best friend, Eun-joo, try to report the hacking to the police but are told to find evidence of the hack first. Jun-yeong intercepts Na-mi and Eun-joo's message to their friend who is a digital safety expert, and presents himself as the "expert" instead. Jun-yeong manipulates Na-mi to believe that Eun-joo is responsible for the hack; Na-mi and Eun-joo have a falling out, leaving Na-mi completely isolated.

Na-mi remembers going to the repair shop and returns there, where she meets Ji-man and his partner, Kim Jung-ho, who have also just tracked down the shop. Na-mi realizes that Jun-yeong was responsible for the spyware and suggests setting a trap for him at her apartment; she is unaware of the danger, as Ji-man doesn't tell her that Jun-yeong is a serial killer. Ji-man and Jung-ho see Jun-yeong approach Na-mi's building but do not recognise him and let him leave.

Believing the trap has failed, Ji-man and Jung-ho send Na-mi to her father's house. Jun-yeong is already there, and he taunts Na-mi, forcing her to drown her father in the bathtub. Unknown to Jun-yeong, Ji-man and Jung-ho have received a signal from Na-mi and return to the house, where they apprehend Jun-yeong. It is revealed that "Jun-yeong" stole the identity of Ji-man's son, the real Jun-yeong, who was his first hacking victim. Na-mi, believing her father is dead, shoots "Jun-yeong". However, Na-mi's father is alive, and Ji-man accepts the blame for shooting "Jun-yeong", who is arrested.

In the aftermath, Na-mi returns to her life, continues working with her father, is reconciled with Eun-joo, and her social media reputation is restored.

• Chun Woo-hee as Lee Na-mi^[4]

A marketer at a startup company.

• Yim Si-wan as Oh Jun-yeong/Woo Jun-yeong^[4]

A man approaches Nami after accidentally picking up her smartphone.

• Kim Hee-won as Woo Ji-man^[4]

A detective chasing the culprit of a murder case.

• Park Ho-san as Lee Seung-woo^[5]

Nami's father.

• Kim Ye-won as Jeong Eun-joo^[6]

Nami's best friend.

• Oh Hyun-kyung as CEO Oh^[6]

The president of a startup company is Nami's senior.

• Jeon Jin-oh as Kim Jung-ho^[7]
• Kim Joo-ryoung as Eun-mi
• Gil Hae-yeon as Je-yeon

The film is based on the Japanese novel „Sumaho wo Otoshita-dake-nanoni“ (All I Did Was Drop My Phone) by Akira Teshigawara, which was adapted into 2018 film Stolen Identity. The principal photography began in March 2021 and ended on June 27, 2021.^[8]

The film was originally scheduled for the theatrical release by CJ ENM, but later decided to be released on Netflix.^[9]