Apt. is a 2006 Korean-language Crime Horror film written by Ahn Byeong-ki and Lee So-yeong. The movie is directed by Ahn Byeong-ki and produced by Ahn Byeong-ki. Se-jin, a young woman who lives in an old apartment in a Seoul suburb, amuses herself by observing the windows of the apartments on the other side. One day, she notices that the lights of some of these apartments are turned off at the very same time. She begins to suspect that this pattern is somehow related to a series of mysterious deaths in the neighborhood. She becomes and deeply involved as she attempts to solve the mystery. Written by Anon. Apt. stars Ko So-young, Kang Sung-jin, Jang Hee-jin, Park Ha-sun, Yoo Min, So-young Ko and Ju-seok Lee. The film is based on APT by Kang Full. The music was composed by Oh Bong-jun. Cinematography was done by Yun Myeong-sik and editing by Kim Sun-min. The motion picture has a running time of 90 minutes. It was released on 23rd November 2006. Apt. was made on a budget of $3 million and at the box office it grossed only $3 million. Distribution rights for the film were acquired by Showbox.