In May 2015, Zhao received a call from a friend, claiming that a client of Song Jun, a former controller of the Air traffic control bureau of CAAC, wanted to fish out his female secretary. He later learned that the client, Guo Wengui, the actual controller of Beijing Pangu Investment Co., Ltd. and Beijing Zhengquan Holding Co., Ltd., fled overseas in August 2014 on suspicion of multiple crimes.