Knock (2012)

" Knock " (original title: 노크) is a 2012 South Korean supernatural horror film. It aired on MBN on Friday, August 10, 2012 at 11:00 pm and then screened in theaters on November 29.

Plot
Art student Jeong-hwa (Seo Woo) is moving to a smaller apartment by her school when she trips and falls, breaking a small statue on a box. She bends over to pick up the pieces and notices an amulet the shape of a queer mask and decides to use it for her exhibit assignment. After she moves she hears a weird knocking sound next door. She can't sleep because of the knocking sound every midnight and starts sketching the amulet. One night, Jeong-hwa comes home late and runs into a strange woman with long tangly hair and barefoot in front of the elevator. She gets off without a word and starts knocking next door. Jeong-hwa is terrified, and to make matters worse, a neighbor obsessed with the girl is willing to use magic and mind control to have her.