This portal to the underground world is truly astonishing!
He originally thought they just needed to find a way back above ground, but now it seems...
It seems...
They're meant to open a two-way portal?!
This...
Xu Xin's expression grew slightly serious.
It means that once this portal is opened, it will remain, allowing them to travel to and from the underground world.
But that brings up a problem.
Will only they, the survivors, be able to use this portal to travel to and from the underground world?
Or can the creatures from the underground world... also use it?
Is it really an open portal, or is it controlled by them?
If it's an open portal, even if they manage to get out, there will be major trouble.
But...
A hint of helplessness flashed in Xu Xin's eyes.
That's something they can't avoid.
Even if it's an open portal, they have to open it.
Otherwise, the mission cannot be completed, and the six of them would have to... "leave this beautiful world forever."
