청각 장애가 있는 소년 창쳉은 특수 학교로 전학간다. 창쳉은 자신과 비슷한 처지의 아이들과 함께 생활하게 될 것에 기대를 갖는다. 하지만 통학 버스 뒷자리에서 벌어진 끔찍한 사건을 보면서 큰 충격을 받는다.

Hearing-impaired teenager Chang Cheng transfers to a school for children with special needs. However, the world of the hearing-impaired doesn't seem quiet at all. When Chang witnesses the "game" taking place in the last row on the school bus, his excitement about blending into a new environment immediately turns into fear. Seeing Bei Bei, the girl he has a crush on, getting hurt so badly, Xiao Guang, the ringleader, behaving like a king and other schoolmates acting innocent, Chang debates with himself on whether he should reveal the cruel truth about the game or whether he should join in. As the divide between the perpetrators and the victim begins to blur, confusion and anxiety grow among everyone in school.