At the end, a wave of the male protagonist was sent to the underground factory and saw his girlfriend at work.
So the inside story appeared: under the banner of the reduction plan, the ruling class actually provided free labor for the underground factory, and created wealth = slaves by exploiting the labor of the underground factory personnel.
As for where did the young children go? Just make up for this by yourself. In the Snow Country Train, one of the children's roles is to get into the engine and replace part of its function.
The director of this film is not strong enough, it could have been better.
It was legend that one of the producers watched the film.
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