The captain of the criminal investigation detachment is full of ruffianism. He appears careless but is actually very thoughtful. He is both an enemy and a friend of Guan Hongfeng.At the crime scene, the physical appearance of the criminal suspect can be inferred only from the clues left at the crime scene.After Guan Hongfeng resigned as detachment leader, Zhou Xun was under pressure to solve the case. In order to track down Guan Hongyu's whereabouts, he invited Guan Hongfeng to participate in the investigation of serious cases as a non-staff consultant, while keeping an eye on Guan Hongfeng everywhere.