Who sent the text message to Fengyun in Macau?

It's from the fake policeman who came to pick up Aaron. Although it is not clear, according to the plot, Aaron opened the trunk of the car, which contained several bodies. These bodies are real policemen, and the fake policemen who came to pick up Aaron are fake policemen. Why do real cops die? Obviously, they were controlled by gangsters and forced to confess, so they had a text message and a fake policeman killed Aaron, hehe.