In his previous life, he was a criminal psychology expert who stood at the top of criminal investigation, but he died accidentally while investigating a serial unsolved case. In this life, he was reborn in the 1980s and became Lin Zheng, a street kid who "doesn't do his job properly" in the words of the police station elder father.
In this era, criminal investigation technology is backward and people's hearts are simple and treacherous. Lin Zheng wanted to live a comfortable life, but unexpectedly discovered that he could understand animal language. From then on, the world no longer had any secrets in his eyes.
From a "street kid" who was looked down upon by others, to a police legend that makes countless criminals fearful. Lin Zheng used his knowledge and unique abilities that transcended the times to solve old cases and fight against the dark forces. However, as each case was solved, he was shocked to realize that the clues to the unsolved case he had pursued in his previous life were looming in the dust of the 1980s... This time, he not only had to fight for justice in this life, but also uncovered the truth about the fate of his previous life.
Su Wan is the heroine?