Death prediction phone calls connected a decade of mystery. Each caller received a message from the deceased mother: the mother in the confinement center received a "baby transfer" scam, but her own wail of miscarriage was heard on the receiver; the script-killing DM took off his mask to reveal the face of the drugstore owner who was cremated ten years ago... All clues pointed to the old landline phone in the abandoned phone booth, and the two bloody fingerprints on the tenth call answer key sewn the fates of Cheng Ye and Su Tang into the same dark web - the canine scars on their backs were the "recycling marks" of the MLM organization ten years ago.
The notebook of lame detective Lu Chen is filled with telephone circuit diagrams, and each node is a victim who was bewitched by the voice of "mother". When Cheng Ye discovered the body of Su Tang's husband's mistress in the morgue, and when Su Tang saw the twisted "17" pressed by the old man in the nursing home, the dial tone on the seventeenth floor of the mental hospital suddenly sounded. In the live broadcast on the mobile phone, Su Tang was tied to a phone booth. The "mother" in a floral skirt behind the camera raised a dagger, and a mechanical child's voice rang out the death multiple-choice question: "Who will answer the fifteenth call?"
Legal terms and code procedures become weapons, and two women with their spikes removed fight in daily traps: Is "Mom loves you" a warning that spans life and death, or is it a disguise for the murderer? Hidden at the end of the seventeenth flight of stairs is the mother's suicide note, or is it the factory certificate that they were used as "experimental products"? When the answer button for the tenth call is about to be pressed, the truth that was tampered with ten years ago is slowly being restarted with the dial tone.
