Ten years ago, elite criminal police officer Li Bing was dubbed a "dirty policeman" and was wrongfully imprisoned. He eventually died tragically in prison. When he opened his eyes, he returned to three months before the incident, and the gears of fate had just begun to turn. Behind the smiling faces of his former comrades, there may be a poisonous blade that killed him; beneath seemingly ordinary cases, there is a huge black network that can subvert everything. This time, Li Bing returned with ten years of regret and unwillingness, and with his obsession with the truth. Before the trap closes, he wants to find out the powerful "conspirator" hiding in the police station and clear his grievances. But when he relied on his past life memories to take action again and again to reverse the defeat, he was horrified to find that the man behind the scenes seemed to have already seen his "unpredictable", and a new game against him was quietly being laid... In this battle between good and evil that spans time and space, every step is on the edge of the cliff.