Leng Shaoting's friend found that the only person who transferred money to Luca was a businessman called Smith, and his name was also on the list of the call records.
Most importantly, Smith had been to the city where Gu Ning had stayed.
Gu Ning had never been to Country Y before, so she was sure that the mastermind behind this scheme couldn't be a foreigner.
Smith had been to the same city where she had stayed before, and he also called and made a transfer to Luca, it was highly likely that he was the middleman. Gu Ning had never seen Smith before after all. Therefore the mastermind had to be someone else.
After that, Gu Ning looked at the contacts in Smith's phone, and found Leng Shaojia's number.
The second Leng Shaoting and Gu Ning saw Leng Shaojia's name, they knew that she must have been the hirer of the professional killer. Leng Shaojia never liked Gu Ning and always wanted to cause her trouble.