Drama Special - Glass Prison (Drama - 2012)

Source

Synopsis
That night, Soo-jeong is attacked by an unknown assailant and becomes unconscious but manages to escape the situation thanks to someone. When she comes to she is at a house in an isolated area. The person who saved her is Se-hyeon, a deaf person.

Se-hyeon keeps doing strange things without saying a word. Medical tools can be seen everywhere and CCTV's are installed so every part of the house can be watched. Soo-jeong feels instinctively thretened by him. Just as she is about to get out of the house she finds the final clue regarding her sisters death ten years ago...