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The real killer at 00:42 was actually the Genius Club, and Ji Xinshui and the others were merely making a clumsy imitation of this manner of killing.
According to Lin Xian's speculation,
the parents of Ji Lin and the father of Big Face Cat were likely all killed by the Genius Club.
They shared a common identity—
[Mathematicians].
Therefore, Lin Xian reached an unverified conclusion.
Could it be that the true targets of the Genius Club were only mathematicians, and the killing of other scientists was actually Ji Xinshui's own judgment?
This hypothesis isn't guaranteed to be accurate, but, as it stands, there is some evidence to support it.
First of all, the Genius Club indeed has a connection to the mysterious number 42, the universal constant. They kidnapped Big Face Cat's father in the second dreamscape, very likely due to their fear of this number.
And the cosmological constant is, obviously, a mathematical issue.
