A well-planned murder occurred in Yuhai City. An antique collector died mysteriously at home. The scene looked like a tried execution ground. Interpol captain Gu Bai took over the investigation, and all the clues vaguely pointed to the deceased's unusually calm adopted daughter - psychology expert Ye Ji.
Ye Ji carries an elusive sense of contradiction. She is both a suspected suspect and an insight into people's hearts. What made Gu Bai even more uneasy was that she was actually inextricably linked to his late mentor, who had kept secrets. The case is not yet clear, and the second murder with the same method once again shocked the city. Anonymous warning letters, mysterious psychology forums, looming shadows of the past... Seemingly unrelated fragments gradually piece together into disturbing patterns in the darkness.
As the investigation deepens, the scars of the past begin to bleed. Gu Bai must face the unsolved mystery of his father's death, while Ye Ji struggles with the huge black hole behind the disappearance of his adoptive father. And the "judge" hidden behind the scenes seems to know each of them well...
Concept: Sin and redemption, the swing of human nature