It was understandable that Tang Ling could not accept that fact.
Even Fei Long could not accept it when he first heard that the planet was hiding another civilization underground.
After the shift in the era, they appeared out of nowhere with vicious ambition and wanted to take over the surface.
He tapped Tang Ling's shoulder and said, "Of course, this matter is far from reaching its final conclusion, but it will eventually be revealed. Being able to think is great, but the ability to think doesn't mean the right to deny everything. If our planet is an apple, the old civilization might have only scratched the skin of the apple in terms of knowledge. They haven't gone into the flesh yet, so it's understandable that they didn't know about the underground."
Tang Ling nodded, acknowledging what Fei Long said, especially the statement that the ability to think did not translate into the right to deny everything.