The phone call was from the guy Yu Jingting had sent to tail them.
He had been shadowing Chen's father and that old lady, and witnessed them entering the restaurant. The old lady had even ordered a considerable amount of alcohol, and was encouraging the old man to drink, one glass after another.
Yu Jingting had initially instructed him to call when he saw the two people sneak into a small woods or into a residential building, attempting to engage in illicit activities.
But the person responsible for tailing them saw that the old man had drunk quite a bit and was afraid he might be harmed from overdrinking. This was when he decided to call Yu Jingting for guidance.
"The address." Yu Jingting asked for the address and briefly reported the situation to Chen Lijun.
"I am going too, Suizi, take the camera with you and get several pictures of him. Teach this old man a lesson for his relentless pursuit of misbehavior. "
On hearing this, Chen Lijun immediately perked up.