Three years ago, a member of an violent gang that had confronted with the Serious Crime Group Six - Liu Zhì, was found dead at home. The younger brother of the gang leader, Wang Xianmin, also coincidentally appeared at the scene and became a suspect but there was no solid evidence against him.
The case is shrouded in mystery. The former head of Serious Crime Group Six, now promoted to be the Deputy Director of Criminal Investigation Team, Zheng Yimin, invited Ji Jie back from the Branch Bureau Preliminary Examination Section to participate in the trial of the case. Despite lack of evidence, years of experience and intuition dealing with criminals told Ji Jie that the seemingly innocent and weak-looking bookworm in front of her, Wang Xianmin, was the murderer.
Thus, a thrilling showdown began.