Thought it was a slow paced boring movie in the beginning, but turns out to be surprisingly good. Even without star actors, the plot and acting are convincingly real, with a lot twists and turns out of expectation, which makes it one of the best thrillers indeed, highly underrated.

A lady suspects that someone enter her house at night unfortunately its true..and her friend and a detective help her for finding that culprit..some scenes very scary and thrilling even without any sound effects...surely its worth to watch atleast one time..

There's little more frightening than being a victim within the comfort of your own home. 'Door Lock' explores this, and beyond.

There are some really creepy moments here, especially during the final act when we feel like yelling at the characters to just turn around and LOOK! Kong Hyo-Jin stars as Jo Kyung-Min, a young woman living on her own in a small apartment. One night whilst getting ready for bed, she notices someone trying to open her front door. Afterwards, the police doesn't believe it to be a legit case and she decides to do her own investigation when there's another attempt at entry into her apartment, and a murder.

Typical of Korean horror films, the film is unpredictable and off course the shock factor is there as well. 'Door Lock' reminded me of films like 'The Chaser', 'I saw the Devil' (only not nearly as brutal),and 'Manhole'. There are some truly nerve wrecking moments, but ultimately the film didn't impress me as much as other Korean genre films. It was nevertheless a good film, and very creepy.