In a remote mountain village in South Korea, although life is not affluent, there has been a long-lasting peace, and people seem unaware of approaching danger. Everything changed one evening when a sudden murder occurred in the village, shattering its tranquility. Chonggu, who serves as a police officer in the village, and his peers quickly rushed to the scene to investigate. He initially deduced it to be a heinous murder, but locals privately speculated that a Japanese man, who had mysteriously appeared in the village's outskirts, was the prime suspect. This Japanese man was suspected of practicing some form of sorcery, cursing people to death through supernatural means.

One night, numerous tiny organisms, ominously dubbed "parasites," drifted onto the sea surface. Their target was to parasitize the human brain, instigating people to turn against each other in a frenzy of violence.

Boundless fear, despair penetrating to the core, and an ending far beyond expectations.

The film is adapted from the 1999 video game of the same name and follows the story of a mother, Rose, who discovers that her adopted daughter, Sharon, is suffering from a mysterious mental illness. Sharon cries out "Silent Hill" in her sleep while sleepwalking. In an effort to solve the problem, Rose takes Sharon to the place called Silent Hill.

十八世纪末期的纽约，警察们还延用古老的办案方式，对罪犯刑讯逼供，年轻的警察伊卡布·克瑞恩笃信科学的办案方式，因此受到市内同行的排挤，被派到一个名叫睡谷，也称作断头谷的小镇办理一起连环凶杀案。断头谷一直流传着关于“无头骑士”的传说，据说，他是一位嗜血而战的黑森林雇佣军，被敌人割去头颅后，他的孤魂一直在断头谷游荡，在月黑风高之夜，他会骑着快马、 拿着大剑将经过此地的行人的头颅割下