In 1998, murders occurred frequently in the old border town. There was a judge code-named A in the dark, who specifically targeted those who had committed crimes and escaped guilt, and deliberately left loopholes to attract police investigation. Ling Zhi, a young criminal investigation captain, repeatedly encounters Jiang Li, a pale-faced first-year history student who has been suffering from chronic illness at the crime scene. Her words and deeds are intertwined with truth and falsehood, sometimes showing weakness and sometimes hiding her edge. And as the case was gradually solved, a shocking secret that had been buried for many years and no one knew about it began to emerge in Jiang Li.
