Seven years ago, a failed rescue operation caused detective Chen Che and criminal profiler Lin Mu to part ways, leaving an old case unresolved. Seven years later, a serial killer, under the name "Seven Days of Trial," perfectly replicated his old tactics and publicly challenged them. The two people who were forced to reorganize were an action captain who had tempered his iron intuition on the front line, and the other was a psychology professor who built a wall of rationality in his study. The mystery of the old case remains unsolved, and the countdown to the new case has begun. During the seven-day life-and-death pursuit of the murderer, they must cut through each other's deep-seated knots and wounds, and find the only path to the truth amidst lies, traps and deadly threats. This is not only a hunt for the murderer, but also a redemption for past mistakes - when all the evidence points to the end, can they seize the opportunity to reunite the broken trust and feelings on the seventh day?
