饰）。 姜仁浩妻子早亡，8岁女儿松儿天生哮喘由祖母照看，所以他不辞辛苦谋职养家。然而，双胞胎的校长与教导主任竟逼仁浩索贿5千万韩元，并美其名为学校发展基 金。同时，姜仁浩逐渐发现学校笼罩着一种紧张压抑的气氛，令人窒息。尤其有三个孩子引人关注：聪颖的金妍斗（金贤秀 饰）和贪吃的陈宥利（郑仁絮 饰）总是躲闪。全民秀（白承焕 饰）的弟弟自杀
Kang In-ho (Gong Yoo
) is the newly appointed art teacher at Benevolence Academy, a deaf school
children in the fictional city of Mujin, North Jeolla Province
. He has a dark past - his wife was a high school student who committed suicide and his daughter is under the care of his mother. He is excited to teach his new students, yet the children are aloof and distant, trying to avoid running into him as much as possible. In-ho does not give up, however, trying to show the kids that he cares. When the children finally open up, In-ho faces the shocking and ugly truth about the school and what the students have been enduring in secret: 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 Yoo-jin (Jung Yu-mi
). But he and Yoo-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.
In addition to using "privileges of former post" (Jeon-gwan ye-u
) the accused do not hesitate to lie and bribe their way to get very light sentences.