Lin Mo, who was a frightening serial murderer in his previous life, was reborn as a baby from a rich and police family in an accident. After his rebirth, he brought with him the memories of his past life and the mysterious system, and wanted to rewrite his life and become a final detective who would make criminals tremble. However, his criminal accomplices in his previous life were afraid that he would reveal his crimes and constantly hindered his investigation and caused all kinds of trouble.
Lin Mo faces huge challenges. On the one hand, he must use his murderer's thinking to solve the mystery; on the other hand, he must solve major and difficult cases in a short period of time and establish his reputation in the police community. However, due to his previous identity, some people in the police community misunderstood him and questioned his motives and abilities, causing him to be ostracized.
In the process of solving cases, Lin Mo often faces a dilemma: whether to use his previous criminal experience to quickly solve cases and gain reputation, or to stick to the bottom line of justice in the police industry. Every time he successfully solves a case, he has to face the painful past of being a criminal, and there is bitterness behind his victory.
The pressure to solve major cases within a time limit is always there. If the opportunity is missed, criminals will go free. The betrayal and use of criminal gangs in his previous life even triggered a crisis of trust in him among the police. However, Lin Mo relied on his perseverance and the help of the mysterious system to grow step by step in the difficult situation, and finally defeated the criminal forces in his previous life, becoming the true final detective, making up for the regrets of his previous life, and gaining the recognition of the police and the trust of his relatives.