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.
In 1636, the Qing dynasty attacks Joseon. King Injo and his retainers, including Choi Myung-kil and Kim Sang-hun, hide in the mountain fortress city of Namhansanseong. They are isolated from the outside. Meanwhile, Choi Myung-kil insists that they enter into negotiations with the Qing dynasty, but Kim Sang-hun proposes that they keep fighting.