Night falls over Jingang once again, shrouding the city in gloom. A string of teenage girl disappearances leaves no trace, and Zhou Xun's Changfeng detachment is at an impasse. Guan Hongfeng, lying low in the shadows, cannot stand by as the crimes continue to spread. Relying on his keen investigative instincts, he secretly joins the investigation, only to discover an unexpected link to an unsolved case from years ago. The outline of a mysterious criminal organization begins to emerge.
In prison, Guan Hongyu has not given up. Drawing on his extraordinary resourcefulness, he gathers scattered clues about the organization from his fellow inmates and sends them to his brother through a special channel. In the police force, Zhou Shutong is no longer the rookie she once was. Despite the pressure of breaching protocol, she passes crucial files to Guan Hongfeng, becoming a vital link between the shadows and the light. Meanwhile, Zhou Xun must contend with pressure from his superiors and the strain of making a breakthrough in the case, all while watching out for a turncoat within the force. He is under attack on all sides.
As the investigation deepens, the dark dealings at the Crescent entertainment venues, the drug-trafficking network, and the turncoat's secret sabotage emerge one after another. Guan Hongfeng repeatedly finds himself in danger, and the organization even marks him for elimination. To save the kidnapped Zhou Shutong and expose the truth once and for all, Guan Hongyu risks breaking out of prison. After a long separation, the brothers stand side by side again, joining forces with Zhou Xun from within and without to face off against the mysterious organization's leader, the Shadow. As gunshots tear through Jingang's night sky, the turncoat is captured and the organization is destroyed. Will the Guan brothers finally see a glimmer of hope in their quest to clear their names? This pursuit of the truth, spanning light and shadow and bound up in loyalty and justice, will reach its final judgment as night gives way to day.
