But if the opponent could easily mix in some people into their army, then their situation wouldn't be good.
Because if there were too many people from the other sides, their information might be leaked out.
"How many years?" Yan Jin Nian asked.
"What?"
"I mean, how many years has it been since the spies come in." Yan Jin Nian sighed. "You know very well that people who could be spies are people with strong conviction for their motherland or their place of origin. They have a strong willpower and reasons why they are willing to be spies."
The others nodded.
This was common knowledge.
After all, not everyone could be spies.
If their willpower was too weak and easily fall to temptation, then they were not suitable to be spies. Sending them out would only send them to their death, which was useless.
