Wei Zile (played by Zhang Yikang), the mastermind behind the “Tiger Killing Case”, was arrested. He became crazy due to brain damage and will be imprisoned in a mental hospital for life.When a dignitary from an African country comes to Hong Kong, Mr. O is ordered to provide protection, but is suddenly attacked by multiple killers...
Policewoman Ma Yingsi (played by Lin Xiawei) withdraws her decision to resign and is transferred to the psychological services department. O-Ji detective Xu Junsen (played by Chen Zhanpeng) explores the possibility of getting back together, and Yingsi expresses that she has put aside her relationship.Another O-Ji detective, Detective Sim Weili (played by Huang Zhixian), and barrister Chung Jiayu (played by Jiang Zuman) sparkled in the court, and it turns out that the two have rekindled their love.
When the payment vehicle was robbed, Mr. O discovered that the robbers were assassins on an assassination mission and believed that they would commit crimes again.The killers are in internal strife, and the remaining two killers are at large. Junsen and others find key clues...