After the three jumping incidents, the building was almost empty, and the whole building was shrouded in shadow. The management staff blocked the roof, and the only key to open the door of the roof was in his hand, and no one was allowed The idlers waited, and the cleaning staff went up to clean one day a month, and never saw anyone at other times.

On the way here, Hang Jin had a general understanding of Yongming Building, so without asking, he knew that the person who called the police was the cleaning staff who went up to the roof to clean.

The door on the roof is a thick steel door, and it cannot be knocked open. Even if it can be knocked open, it will cause a huge noise. The security of the building will definitely find out, so now the clues can only be found in the management personnel of the building.