It is a film of Asian origin, specifically South Korean, which touches on a controversial, very delicate subject, when I watched its advertising where they show a child on the floor sitting and crying, I imagined that it could be child abuse by a figure of power as a teacher and I was not so wrong, but I lacked much depth to imagine the whole context.

The film is based on a school of children with hearing and mental disabilities, most of them are deaf - dumb - orphans and without resources, living in a state institution run by corrupt and sexually perverted people, in these spaces inhumane and atrocious events occurred with children, where everyone was complicit from the director to the maintenance or security.

One of the teachers is an expert in sign language, a widower who lives with his mother and his little daughter, what he earns in his city is not enough to support his family and decides to accept the job in this institution, although he is far from his family the payment is high, something that caught his attention, but he had no reason to think badly, it turns out that his application had not been a coincidence, they knew very well his economic situation and intended to manipulate him with the high payment in exchange for his silence in case he found out.

The teacher observes an isolated behavior in the children that does not correspond to their condition and begins to suspect that something is going on, but it is difficult to gain their trust overnight and even more difficult to talk about sexual crimes, in the end he succeeds and it is the beginning of a personal struggle against a power struggle.

The film touches on themes such as rape, childhood depression, suicide and revenge.