Emily is an idealistic woman who is single and has a boyfriend who is a psychiatrist. Live alone in a large two-story house. She works in a child welfare agency, and her daily job is to help children who are victims of domestic violence escape their misery and use the law to take away the custody of their irresponsible parents. During this time, Emily was very busy and had 38 cases to deal with, but his boss assigned her case No. 39. The "victim" of Case No. 39 is a little girl Lily, beautiful and well-behaved, but her parents are always plotting to kill her. One night, Emily received a call from Lily, who said her parents were going to kill her. Emily rushed to Lily's house desperately and rescued the overly frightened Lily from the oven.
Starting a new life, Lily and Emily live together. They appear to be a close and good mother and daughter at first, but things are far less peaceful than they seem. Emily's case goes awry when a young boy kills his parents. Phone records show he received a call from Emily's house the night before he killed his parents. But Emily never called, and Lily denied it. When Emily came to the prison to ask the little boy's phone number, the little boy died suddenly, one by one mysteries haunted Emily. It didn't take long for Emily's psychological boyfriend to also receive a call from Emily's mobile phone, and soon he also self-harmed and died in the bathroom. After checking the recording of the call, Emily discovered that Lily was not an ordinary girl, she was possessed by a demon and was the devil's spokesman. So she tried everything she could to kill Lily, just as Lily's parents did. But Lily has good intuition and perception, and she can control people's thinking. To kill her, she must first overcome her own fears. Those who died before, without exception, died in the illusion that Lily planted in their minds.
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