If the movie is not seen as a farce, I personally guess that the murderer may be the maid and the lawyer
First, why is it not Shuang's daughter, because at the beginning of the movie, it is said that Shuang's daughter is only 32 years old. The age of this maid's actor is obviously not suitable.
Second, Shuang died five years ago, the murderer hid his body, and for five years he pretended to be Shuang to pretend that he was still alive. Moreover, the murderer knows Shuang's daily habits very well to be able to imitate a person, because Wang was once Shuang's adopted son and did not see any flaws. So guess this lady may really be the maid or housekeeper before the twins.
The maid and the lawyer teamed up to kill Shuang five years ago, and then hid the body in the filing cabinet. Because the lawyer had an accident last month, Shuang's body was found, so the maid designed everything and hired a very authoritative detective. to confuse people.
Shuang on the table said that both the murderer and the victim were in the dining room, which may mean that Shuang existed as the victim and the fake double as the murderer at the same time. Also in line with the insinuation of the housekeeper's righteous wife's own murder.
In the end, the blind butler should have been hired on purpose, just like the fake detective.
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