There is no perfect murder in the world. Every step you take will inevitably leave traces and surprises and flaws. For Tony's well-planned murder, Leith's failure and death become an accident, and the key swap becomes a loophole. The whole film unfolds through a large number of dialogues, Tony's planning of the murder, Mark's exculpatory and correct assumptions for the murder, the sheriff's reasoning about the case, and a large number of dialogues are laid out to show the ins and outs of the murder. If you miss a line, you miss the whole murder. This film reminds me of "Gone Girl" and "Detective Chinatown," where seemingly perfect murders always leave clues. There is no perfect murder case in the world, I don't know how Chen Sicheng will show us a "perfect" murder case in the third "Detective Chinatown".
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