Based on actual events that took place at Gwangju Inhwa School for the hearing-impaired, where young deaf students were the victims of repeated sexual assaults by faculty members over a period of five years in the early 2000s.
Kang In-ho
Gong Yoo
Seo Yoo-jin
Jung Yu-mi
Kim Yeon-doo
Kim Hyeon-soo
Jin Yoo-ri
Jung In-seo
Jeon Min-soo
Baek Su-ho
Principal / Principal's Brother
Jang Kwang
Yoon Ja-ae
Kim Joo-ryoung
Park Bo-hyeon
Kim Min-sang
Young-hoon
Lim Hyun-sung
Attorney Hwang
Jeon Kuk-hwan
Prosecutor
Choi Jin-ho
Judge
Kwon Hong-suk
Police Officer Jang
Uhm Hyo-seop
Principal's Wife
Park Hye-jin
In-ho's Mother
Kim Ji-young
Sol-yi
Kim Ji-young
Young-soo
Uhm Ji-sung
Auto Repair Shop Owner
Lee Sang-hee
Professor Kim Jung-woo
Nam Myung-ryeol
Hostess 2
Park Kyoung-hee
Courtroom Sign Language Interpreter
Jang So-yeon
School Custodian
Hong Seok-yeon
Broadcasting Station PD
Heo Jae-ho
Publishing Company Employee
Jung Hyung-suk