Most importantly, why should the plan to escape the city be kept secretly sealed by the mayor, and will it be made public from the very beginning? Let everyone in the city know that 200 years is a time limit and will return to the ground later in the future.
When the city was built, didn't everyone know that the city was doomed to die?
Moreover, 200 years is not a very long history, how can these people forget it?
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