The theme of the film is rather gory.
He is a mysterious person who hates people in society who do not know happiness in the midst of happiness. He thinks that people in society do not know how to be grateful.
Just lock the target he is aiming at, lock it in a dark environment, let him play a life and death game, complete the task within the specified time, then he can save himself, if not, he will be killed in a cruel way.
And the mysterious man was watching the live broadcast up close in a corner, watching this perverted killing game...
There are a lot of films in the whole series, and it is worth watching.
The trouble is that there are too many memories and too few straight-line plots.
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