Xiao Muchen, the leader of the criminal investigation team, was cold and lonely, buried in the murder case, and buried his youthful worries for five years. A case of serial disappearances on a rainy night brings back Ling Xuan, a criminal psychologist who has returned from studying abroad. He is also an old friend who suddenly separated when he was young. The two powers work together to analyze the murder case, draw a profile, expose paranoia and evil thoughts in the dark, and hunt down the hidden murderer. Old cases are filled with grievances, and hatred is weaving a web. The two rely on each other tacitly in the crisis of the blade, and gradually break their guard against temptation. The secret behind the farewell without saying goodbye was revealed, and the dust-laden love was revived in the dark night. Han Ren hides gentleness and forbearance hides affection. They solve unresolved cases and overcome dangers together. In the boundless darkness, they become each other's only salvation and the light that will never be extinguished.
Purpose: 1. Justice will eventually overcome the darkness, and the obsession with legal redemption: Use serial murders and old revenge cases to analyze human nature's greed, anger, obsession, and hatred, and point out that lynching and revenge are ultimately the wrong path. Only legal principles can rectify the source and end the evil consequences.
2. Reunited after a long separation, both sides run towards redemption: estrangement and missed moments are all things of the past. Two lonely people rely on each other in a crisis to heal each other's youthful regrets. Love is the most stable foundation in the dark night.
3. Looking for light in the cold night, stick to your true heart and warmth: On the dangerous road of criminal investigation, you have seen the worst of human nature, but you still keep your original heart and gentleness; in a dark place, if you have a close friend by your side, you will not be afraid of the lack of light ahead.