Door Lock is a 2018 South Korean psychological horror-thriller film directed by Lee Kwon.

[5] While the original tells the story from the perpetrator's perspective, this adaption is from the victims point of view.

One day, she found a trace of a stranger breaking into her room and soon a mysterious murder case begins to unravel.

When she gets to her place after work, she finds her highly secured door lock cover left open.

A few days later, she finds more hints of someone trying to enter her home, and a murder incident occurs.