Haunted House Inspector

A high-end community with one household per floor. The owner disappeared when he returned home on the first night he bought the 18th floor. In the elevator surveillance, he clearly walked out of the 18th floor. But the surveillance at home never caught him entering the house from beginning to end. I didn't find out until I went in for a home inspection. Below the eighteenth floor, there are seventeen more eighteenth floors. My name is Wu Quanfeng. Specially inspect houses that should not be inhabited.