Jingang City, 2018.
Lin Shen, deputy captain of criminal investigation, and Su Wanqing, a criminal psychology consultant, teamed up to detect three cases that seemed unrelated but actually had undercurrents: a botanist died in a greenhouse surrounded by rare butterflies; an oceanographer drowned on a deep-sea research vessel; and a plastic surgeon's body was found in a secret room filled with mirrors.
Every scene is like a carefully planned exhibition - the murderer is not just killing, but also sending a message.
As the investigation deepens, a mysterious codename emerges: "Mentor".
He hides deep in the Internet and induces others to commit crimes through online psychological manipulation. He never does anything himself, but secretly weaves a sinful network. Lin Shen gradually discovered that the direction of his pursuit seemed to be guided by an invisible hand.
When the truth was revealed, Su Wanqing discovered that her sister, who had been missing for three years, was inextricably linked to the case. And Lin Shen also realized that on the road to pursuing the truth, everyone may become a prisoner of their own choice.
"When you gaze into the abyss, the abyss gazes into you."
