Door Lock is a 2018 Korean horror drama film directed by Lee Kwon. It stars Gong Hyo-jin, Kim Ye-won, and Kim Sung-oh. It was released on December 5, 2018. The film is based on the 2011 Spanish film Sleep Tight. While Spanish films tell the story from the perpetrator's perspective, Korean films tell the same story from the victim's perspective.
Kyung-Min is the average woman who lives alone in an apartment. When she arrives at her place after work, she finds the door lock cover securely secured to open. Slightly scared about this, she changed her password. However, just before she went to bed, she heard someone trying to unlock her door. Startled by this, Kyung-Min calls the police. However, the police are only annoyed and do not sympathize with the scared Kyung-Min. A few days later, she discovered more signs of someone trying to enter her home, and murder occurred. Realizing she was unsafe and the police unreliable, she began investigating herself. A door lock box remained open, unknown fingerprints on the keypad, and a cigarette found in front of her house, someone here!
Gong Hyo-jin as Cho Kyung-min
Kim Ye-won as Oh Hyo-joo
Kim Sung-oh as Detective Lee
Lee Ga-sub as Han Dong-hoon
Lee Hong-nae as a police officer
Han Ji-eun as Kang Seung-hye