APT (released as 9:56 in Singapore) is a 2006 South Korean horror film, directed, produced, and written by Ahn Byeong-ki and starring Ko So-young. It is based on a comic by Kang Full. The name APT is from the English word meaning apartment. The film had 644,893 admissions nationwide.Synopsis
Se-jin Oh, a lonely young career woman, lives in a high-rise apartment building in a Seoul suburb, and sometimes watches her neighbors through binoculars for amusement. Taking the subway home one night near Christmas, a woman dressed in red throws herself in front of the train, attempting to drag Se-jin with her. The dead woman haunts Se-jin, though she doesn't know it. However, she does notice that the lights across the way flicker mysteriously at exactly 9:56pm every night -- often accompanied by an apparent suicide.
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