New clues have emerged in the long-dormant 8.17 case, a tragedy from five years prior where two special police officers lost their lives. Driven by a personal connection and the loss of her brother in the incident, investigator Zhou Jin volunteers to join the renewed investigation. She collaborates with criminal psychology professor Jiang Han Sheng, and together they help the police identify a powerful criminal syndicate spearheaded by the mysterious Old Scorpion. Simultaneously, undercover officer Jiang Cheng, who has been deeply embedded for five years as part of Operation Hidden Front, is now on the verge of infiltrating the organization's core. These three young individuals, linked by their shared past, must unite their intellect, courage, and unwavering commitment to justice. They fight tirelessly in their respective positions to dismantle the criminal network, defeat evil, and uncover the buried secrets and regrets that surround the case.
Other names: Gang Tie Sen Lin, Steel Forest