Chen Xu: Deputy Captain of the Municipal Criminal Police Team, 32 years old. An action mistake led to the sacrifice of his partner, and he was burdened with heavy shackles. He suffered from severe PTSD, which manifested as an obsessive obsession with "time." He is keen, stubborn, and free from the edge of the team, but he can also see details that others ignore. When a detective on the verge of collapse due to post-traumatic stress disorder faces a ritual serial killer marked by a "perfect alibi," he must find a way between proving himself and discovering the truth.
