Fang Yi believed Bai Jingjing hadn't been captured for two main reasons. First, his intuition; given Bai Jingjing's intelligence and capabilities, she shouldn't have been caught so easily.
The second reason was that when Fang Yi had expressed his desire to hear Bai Jingjing's voice, Mo Hongbei had responded with Meng Wei's screams to indicate her capture, which didn't make sense.
Meng Wei had been with Bai Jingjing, but Meng Wei's capture didn't necessarily imply Bai Jingjing was also caught. If Mo Hongbei had captured Bai Jingjing, having such a valuable trump card, why wouldn't he use it?
There was only one explanation, that Mo Hongbei was bluffing.
Thus, Fang Yi firmly believed that Bai Jingjing hadn't been captured, she must currently be in Southern Domain City, and also looking for him.
"Liu Lang," Fang Yi spoke, "take out the money and phone you have on you."
Liu Lang hesitated for a moment but then understood Fang Yi's intent and handed over his money and phone.