This... is the underground world.
And the city where Li Wenxi is now, is a supercity located underground, which is even as large as a small country on Earth back in the day.
Of course, when faced with Earth whose surface area has multiplied a hundred times, the area this city occupies is really negligible.
Otherwise, it wouldn't have taken a thousand years to nurture the last branch of humanity without being discovered until now.
Xu Xin guessed correctly, the location where Li Wenxi is now, is exactly where that surviving branch of humanity resides.
When discussing in the treehouse, Xu Ying had already revealed the truth of this world to Li Wenxi, and now Li Wenxi knows that this is Earth a thousand years later and understands their current situation.
The development of this city has always gone very smoothly.
When the location was chosen, the city was selected for its very rich resources.
