Door Lock () is a 2018 South Korean psychological horror-thriller film directed by Lee Kwon. The film stars Gong Hyo-jin, Kim Ye-won and Kim Sung-oh. It was released on December 5, 2018. The movie is based on the 2011 Spanish movie Sleep Tight. While the original tells the story from the perpetrator's perspective, this adaption is from the victims point of view.
Kyung-min lives alone in a one-room apartment. One day, she found a trace of a stranger breaking into her room and soon a mysterious murder case begins to unravel.
Principal photography began on January 7, 2018, and wrapped on March 14, 2018.