Yu Qi got the message from Neko-chan that someone had made contact with Brian Jackson. She told Neko-chan to put a surveillance mode on Brian Jackson to capture the person who gave the order to kill her.
Brian Jackson usually got paid with cash after the job. He would put the money into his account in the small amount of money to make looked like he was working for a normal job. In fact, he owned a small factory that made paper in M Country.
Sometimes, if the person could not pay him in cash, he would tell the customer to pay him in digital currency as such Bitcoin, etc using the dark web. It would be hard to track the money. However, it would be different for the hacker. They would have a way to track the money. And it was not his first time taking such a job.