So-ra, Min-ju and Woong are playing hide and seek but Woong is nowhere to be found. So-ra and Min-ju go to Woong’s house to look for him but the adults stop them. Unable to understand the actions of the adults, So-ra spends the night with Woong left alone in a dark room. The director approaches social problems such as the breaking up of a family, poverty and alienation in a mystery/horror form with children as the main characters.