Plot analysis of the movie "Door Lock" What is the finale?

The hostess, Jingmin, found traces of others entering her house, and finally found the murderer herself, that is, the property in the building where she lived. In the struggle, Jingmin killed the murderer, but the policeman, section chief and best friend who helped her died.

The movie Door Lock is a Korean horror movie. An ordinary white-collar worker, Jingmin Kong Hyo Jin, who lives in an apartment building, found his door lock open after work one day. The door was open. Although there was no one at home, the anxious Jingmin changed the lock password. Before going to bed that night, Jing Min heard someone trying to open her password lock.

Surrounded by fear, she reported the case to the police, but it was not taken seriously by the police. Soon after, Jingmin found traces of a stranger's assault at home. Jing Min became more and more uneasy and decided to pursue the truth of the incident by herself. Unknown fingerprints on the combination lock and cigarette butts dropped at the door surprised her. It turns out that there seems to be another person living in this suite.

Introduction to the film:

Door Lock is a Korean thriller directed by James Li and starring Kong Xiaozhen and Ye Yuanjin. It was released in Korea on February 5th, 20 18. The film tells a series of thrilling stories when Jingmin, who lives alone, finds his home invaded by strangers through unlocked doors and various traces.

Introduction:

Jing Min (Kong Xiao) is an ordinary white-collar worker who lives alone in an apartment building. One day after work, he finds his door lock unlocked. Although there was no one at home, the anxious Jingmin changed the lock password. Before going to bed that night, Jing Min heard someone trying to open her password lock. Surrounded by fear, she reported the case to the police, but it was not taken seriously by the police.

Soon after, Jingmin found traces of a stranger's assault at home. Jing Min became more and more uneasy and decided to pursue the truth of the incident by herself. Unknown fingerprints on the combination lock and cigarette butts dropped at the door surprised her. It turns out that there seems to be another person living in this suite.