Kang In-Ho (Gong Yoo) is a newly appointed teacher at a school for the hearing-impaired in Mujin city. On the way to his new job he becomes involved in a minor car accident and takes his car to a local car repair shop. There his already wrecked car is bumped by a woman named Yoo-Jin (Jung Yu-Mi). Yoo-Jin is an employee at the Mujin Human Rights Center. On the first day at his new school, In-Ho meets the school's principal and director of administration. They are an identical twins. The director of administration asks for a bribe of 50 million WON ($50,000 USD) to work at their school. In-Ho's financial situation is already in dire circumstances. His daughter who is staying with his mother suffers from asthma. In-Ho's wife has passed away. In-Ho makes a phone call to his mother asking for the money. She delivers the 50 million WON by taking out the deposit money for their home. While teaching the hearing-impaired students, In-Ho feels something strange about the kid's distant appearances. On his way home, In-Ho notices one of his students Yoo-Ri sitting on the ledge of her dorm room window, which is several stories above ground. He rushes into the dorm building and makes it into Yoo-Ri's room to pull her away from the window. Yoo-Ri then leads In-Ho to a door down the hall and stops. In-Ho goes into the room and sees the superintendent of the dormitory beating a male student named Yeon-Doo. In-Ho is shocked by the brutality and eventually takes Yeon-Doo to the hospital. In-Ho also makes a phone call to Yoo-Jin, the lady from the huma rights center who bumped into him earlier, and asks her to come to the hospital. Soon, In-Ho and Yoo-Jin uncover unfathomable actions committed by the school's faculty against the students. Their work to break the children's silence is only beginning. Meanwhile, In-Ho feels his own pressures to stay silent as his new job already cost his family their home's deposit money and medical bills are piling up for his daughter. Watch drama online for free.