C227 Three Mysterious Men

Back at the police station, Cai Zhenghua looked at the statement and the recording on the table. He knocked on the desk and fell into deep thought.

Soon, he picked up the phone and dialed a number.

The phone was connected, but there was no reply from the other side.

"3458." Cai Zhenghua said a number.

"The coding is correct. Cai Zhenghua, what's the matter?" At this moment