The Nightmare.

Film director Yeon-woo has a hard time ever since his daughter died a few years ago. Unable to forget her, Yeon-woo writes a screenplay about his daughter. One day when they are shooting the movie, Yeon-woo's wife comes to the movie set in order to meet Yeon-woo. Ji-yeon wanders around the set by herself to end up getting locked in a cold storage unit and is found dead the next morning.