We don't have to pay too much attention to He Jia'an's several gun changes, the point is that he let go of his original self and fell into the maze of gun layout. It's a film that I feel is perfect, and the screenwriter is so talented that it's beyond all my previous imaginations. However, many people don't really get it. Especially in the understanding of the detective's wife Zhang Meihua. Let's start with the "original personality". 
Deep down in the human heart, the primitive personality can be abandoned, but the detective can reawaken it through a specific environment. For example, Gao who is lost in the forest, where he eventually finds himself;Lost in the layout, Ho eventually incarnates as a child and a woman, and his original personality disappearsand the detective's wife, Zhang Meihua. Everyone has their own character weaknesses in their hearts, as obvious as the seven deadly sins. Ho's original character weakness was that of a weak child, a character that was not revealed in his previous circumstances. 
Gao's weakness is the timid, hedonistic "fat boy" who drives him to steal. And Zhang Meihua's weak character is selfishness. In order to survive and maintain a future in the police profession, everyone develops a "ghost" in their mind. Gao has evolved multiple personalities to better survive: lies, violence, technology, etc. And Ho eventually evolved into a lie. The detective's wife did not evolve other personalities, but her weak personality and the original personality could not coexist (as evidenced by the quarrel they had when they met), so she chose to abandon the original personality. This is sad, Lin Xilei said to Chen Huishan: "You hurt him." 
In fact, this is the voice in Zhang Meihua's own heart, but she also knows that if she follows Chen Huishan, her future will also be ruined. in the original text"Selfishness"It seems to be a personality trait that makes the protagonist Meihua appear too selfish when dealing with Chen, and even goes to him when she needs Chen's help. Meihua's inner selfishness made her choose to leave Chen at a critical moment, making Meihua, who was originally thinking about her, disappear, leaving only a selfish character. In Chan's remarks to the detective, she seems to be hinting at the law of social survival, that is, people need to have a certain amount of disguise and disguise in order to survive in society. This seems to be one of the reasons why Meihua left Chen, because she thinks that Chen does not know how to hide himself and cannot survive in this society. In the end, the brilliance of the film is that it reveals the humanity of the detective. 
His act of putting down the gun shows that he also has his own weaknesses and struggles, and that he is also human and has his own ghosts. Through the detective's self-talk and the use of the camera, the director makes the audience think about whether Zhang Meihua is present, and also hints that Zhang Meihua's original personality may not have completely disappeared, but is expressed through the detective's mouth. This is perhaps the deeper message that the film wants to convey: even in a society full of lies and disguises, real humanity and emotions are still present and dominate in certain moments. Becoming a ghost of a detective reminds me of the relationship between Meihua and detectives. Meihua always accompanies the detective, but when the detective shows her talent, Meihua's accusations and worries seem to hint at some kind of inner unease. When He holds the gun, Meihua's speed of cutting meat accelerates, is this related to the detective's inner fluctuations?
The detective has a desire to do his part for society, but his ghost reminds him that the outside world does not believe him and that his actions will only bring disaster. In the final confrontation, Meihua's appearance and her shouts seem to herald a turning point in the detective's fate. What the hell is this?It is a personality formed in order to survive in society. The ghost of the detective is his way of survival, and it exhorts him to protect himself and avoid unnecessary trouble. However, the detective chose to give up his reason, gave up his way of survival, and finally went to death. The detective has encountered many ghosts, including Meihua's abandonment. Gao was burdened with heavy sins, stealing, losing guns, killing people, and all misfortunes seemed to be concentrated on him. In order to survive, he had to evolve more ghosts. 
And Ho, in fear and anxiety, his weakness was exposed, which became a turning point in his life. He is unable to overcome his weaknesses and may therefore derive more "lies" or "violence" in the future. Gao and He, they were not born **, but they made different choices when they faced the dilemma. They all have a desire to survive and keep their positions and their futures. The fate of Gao and He tells us that the choices and decisions in life have a huge impact on fate. If you follow the ghostly desires, life can go on;If you resist it, you will perish. The bizarre nature of this murder makes it difficult to grasp the truth behind it. Do you remember the scene where the detective and his wife rode on the same motorcycle?That undoubtedly adds a touch of warmth to the whole film. 
The wife said to He: "Thank you for letting my husband participate in this matter, he is really happy." On that motorcycle, the two people's hearts seemed to merge, but the director did not repeat this scene at the end of the film, because he knew that it was just a beautiful vision in people's hearts. Only when the detective is recognized by the society and feels his importance to the society, will reality and ideals coexist in such harmony. However, this harmony is only a moment of brilliance, and the era of the past is gone. Today, in a ghostly world, deceit, hatred, selfishness, and apathy are everywhere. For people like detectives, they have nowhere to go. So, in the face of such times, how should we look at ourselves and our society?Finally, I would like to ask a question: have you abandoned your original intention?