This movie starts with the arrival of a new art teacher at a school for hearing-impaired children where he uncovers some truly horrendous wrongdoings. The story told is based on a true case, making it even more horrific to follow. It is a very difficult watch, almost unbearable at some points given the level of violence exerted on some of the protagonists.

The level of acting of the ensemble cast is very high, especially the kids who are delivering beautiful performances. The main leads (Gong Yoo and Jung Yu Mi) are great and interact well with each other and the younger actors.

The production is really well done, some scenes are properly haunting and I was heart-broken more than once because of the tragic plot supported by some gut-wrenching directing choices. As the film approaches the topic of deafness, noises background, sound choices and even at some point music are also key to the well-executed story-telling.

It is not necessarily a film I would like to rewatch, as it is not an easy watch but it really left a deep and resounding impression on me as a viewer. Beyond question, it is an important and crucial cinematographic work touching on serious issues that need to be brought to light despite their darkness.

I would recommend this to people looking for a more serious watch splendidly acted. Be aware that this movie can be very triggering, so mind the warnings.