Gang In-ho, who is working to earn money for his daughter’s surgery, is appointed to a school for hearing-impaired children in Gwangju. But what he discovers there is an ugly truth: the children are being physically and sexually abused by their teachers. When he decides to fight for the children’s rights and expose the crimes being committed at the school, In-ho teams up with human rights activist Seo Yu-jin. But he and Yu-jin soon realize the school’s principal and teachers, and even the police, prosecutors and churches in the community are actually trying to cover up the truth.
2011年，大韩民国最震撼人心的真实一面被突然揭开。尽管难以置信，这一切还是发生了。某听觉障碍学校内一幕幕令人无法容忍的真相大白于众。自2000年起的5年间，该学校的校长和教师对学生们实施了程度不一的性暴力，以及各种虐待。新来的美术教师发现学校里适中弥漫了难言的压抑气氛，并频频听到从洗手间内传出的女子尖叫声。学校的黑幕渐渐露出冰山一角，美术教师和人权主义者力图揭开这些隐藏在象牙塔内的暴力事件，终止校园悲剧的进一步蔓延。