Door Lock is a 2018 Korean-language Thriller film written by Lee Kwon and Park Jung-hee. The movie is directed by Lee Kwon and produced by Kim Sung-ryung and Lee Jae-min under the banner of Fiona Films. A thriller that begins with a murder incident with a trace of a stranger entering the house of Kyung Min who lives alone in the one room. Door lock stars Gong Hyo-jin in the lead role along with Kim Ye-won, Kim Sung-oh, Kong Hyo-jin, Ye-won Kim and Seong-oh Kim in supporting roles. Cinematography was done by Park Jung-hoon. The film has a running time of 102 minutes. It was released on 5th December 2018. The film made a box office gross of $11 million. Distribution rights for the film were acquired by Megabox Plus M.