"Be very aware of him if he contacts you."

Do you mean be very wary of him if he contacts you?
Allow me to add that FTs should be very wary of all training centres and private schools in China, in fact so wary that they should never apply to any of them for a teaching post. moreover, I suggest they should restrict their job seeking to the public sector only, and be very aware that not all state schools and higher educational establishments are worth working for. So, they should be very wary of accepting a job offer from one. Awareness and also wariness are vital whenever one is seeking a secure and bearable EFL teaching post in China.