On a night filled with ominous atmosphere, John (Peter Mooney) and Sarah (Taylor Schilling) welcomed a new member of the family. At the same time, in another corner of the world, a cold-blooded killer was shot by the police and fell in a pool of blood. Shortly thereafter, Sarah discovered that her son Miles, who had heterochromatic pupils, had wisdom far beyond his peers. She was very excited about this and was determined to train her son in a genius way. However, as her son grew older, various anomalies occurred to Miles one after another. He would curse others in Hungarian in his dreams, and would beat his classmates with cruel and fierce means. The cold and cruelty revealed in his eyes made John and Sarah stand uneasy. It was learned from other people that there might be another person's soul living in Miles, and that soul took pleasure in killing and bloodthirsty...