"What were you talking about over the phone?" Mrs. Park asked Ji-Tae the moment he walked inside the family mansion.
Immediately after the detectives left his house, he had hurriedly taken out his laptop to see what was going on over at Jin-A's house so he would know if she was back, but had instead seen Sang-Wook and Sara trashing the house in their search of what he suspected to be the camera he had placed in the house.
They had managed to find two, but one was still in place, and that one happened to be the most important one—the one in her living room, which he had placed close to her chandelier. Of course, they wouldn't think of searching for something like that in that location.
He had been preparing to leave the house for his family mansion when he saw the detectives entering inside Jin-A's house. He had decided there was nothing worth watching since Jin-A wasn't around.