Apocalypse Story Where the Protagonist Builds a Space Station with Help from Their System
The protagonist used to be a scientist. After the apocalypse broke out, he died and was reborn with a System. With the System’s and the country’s help, he overcame all kinds of challenges, eventually built a space station, and then used some kind of time-space cannon to transmigrate to a place I don’t even know. What’s the title?
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