There's a psycho killer in the city you live. No one knows, but his name is Lee Minho. You're a deaf girl who at the moment is house alone for the whole night as your parents are out. Since you can't hear there are lights who can detect sound and flash or do other stuff depending on the noise. Suddenly, the ones at the front door start to flash, as you look, you see the door moving like if someone is trying to open it forcefully.