In a future where artificial intelligence has become commonplace, Sun Dayong and his wife are awakened by strange chopping sounds coming from the basement of their villa. Repair technician Ren Xiao is ordered to investigate and learns that, when the couple moved into the house, they discovered the remains of an intelligent robot named Daisy. While collecting evidence, Ren Xiao finds the long-hidden diary of the Sun family's daughter. As secrets about machinery and human nature gradually emerge, the truth behind the incident proves truly terrifying.