Explosion of Life and Death

An explosion occurred in a warehouse in the north of Binhai City, which shocked the whole city. During the investigation, Xu Zhongmin, the leader of the EOD team of the SWAT team, found that the explosion residue at the scene was very similar to the "June 11" case eight years ago. Eight years ago, a vicious robbery and explosion occurred in a jewelry store in Binhai City. Xu Zhongmin failed to defuse the bomb, resulting in the death of suspect Chai Zhifeng. The gangsters A Gui and Uncle Diao took the opportunity to flee the scene and disappeared from sight. This was the "June 11" case. Xu Zhongmin blamed himself in his heart and took care of Chai Zhifeng's mother and younger brother Chai Zhifei for many years. The Public Security Bureau combined the bombing case with the "June 11" case, and instructed Xu Zhongmin and Qiu Jie of the criminal police team to set up a task force to jointly solve the case, and launched a life-and-death battle against criminals. In the early morning of the same day, Agui, who was released from prison, sneaked into Binhai City and met Uncle Diao in a warehouse. A sudden explosion caused the two sides to send out troops to fight and kill each other...Who is the real murderer behind all this?