APT

A,P,T (a.k.a. 9:56 in Singapore) is a 2006 South Korean horror movie directed by Ahn Byeong-ki, and starring Ko So-young.

Se-Jin, a department store employee, moves into an apartment building in a Seoul suburb where she lives alone. One day as she stares through her window, she realizes that some of the lights in the apartments of the building in front of hers start to mysteriously flicker at 9:56 pm. She starts to suspect that these occurrences are, in a way, linked to a series of suspicious suicides in the neighborhood. She becomes even more involved in the strange cases as she attempts to solve the mysterious deaths.