What many people discuss the most after watching it is that it is impossible to prove that the old man changed the gun. Even if it is proved, it cannot be proved that the old man fired the gun, and the ending of the film becomes an open ending.
In fact, it is not. In the end, it is the external monitoring of his villa that can convict the old man. It is precisely because of his arrogance and his attitude of flirting with the law. Let the crime scene become a scene where there is absolutely no third party, so as long as the murder weapon is found, he can be convicted. It only needs to rule out the possibility of the female protagonist committing suicide, and there is no need to prove who used the murder weapon.
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