Xie Gang Shan, a deep undercover police officer, successfully infiltrated the largest drug trafficking organization. However, during the crucial moment of his mission, he died in an accident. Determined not to let his hard work go to waste, Sui Gong (the captain of the drug enforcement police force) utilized a new technology to implant Xie Gang Shan's memories into an identical death row inmate named Jing Gang Shan. "Xie Gang slowly realizes that he is a replacement, Jing Gang Shan has to endure the betrayal of his family, the misunderstanding of his colleagues, and his heart gradually becomes constricted. However, as he becomes accustomed to the essence of being human, his belief in "goodness" is reignited. Jing Gang Shan vows to become a good police officer and a good person."