Shen Yue could tell that Fujiwara Yabo was hiding something.
His theories on human observation had no problem in this world either!
Perhaps the underworld is just technologically advanced, but people's psychological reactions have not fundamentally changed. So, others might not notice Fujiwara Yabo's concealment, but it was crystal clear to Shen Yue.
The district does not allow its people to lie!
This seems like a cast-iron rule, which even Fujiwara Yabo respects!
But for smart people, all cast-iron rules have rust spots awaiting discovery. Don't lie, just keep silent when necessary, and mislead others to get it wrong with the truth.
It's not my problem if you misunderstood.
This is an extremely clever conversational technique, and obviously, Fujiwara Yabo is adept at this technique.
However, since this technique requires a lot of thinking, Fujiwara Yabo also deliberates it carefully when using it.