In-ho, became an art teacher at Ja-ae Academy, a school for deaf children. On his first day, In-ho is shaken by the blatant requests for bribery by the twins who act as the principal and the head of administration respectively and unwelcoming vibe among kids. Min-su comes late to class, bloodied and bruised his eyes full of rage. In-ho cannot understand the excessive punishment inflicted on the children by some of teachers. One night, he discovers Yeon-du torturing by an after-school counselor Yoon Ja-ae with a washing machine. Outraged, he takes Yeon-du to the hospital and the doctor tells him that Yeon-du was sexually assaulted. This leads to In-ho's discovery that the principal, the head of administration and other teachers had been abusing some students. Yu-jin visits the district police and education boards to report the crime, but nothing comes of it. Eventually the news media gets involved and the principals face a trial.