Why the doors of KTV rooms in Tianjin are all transparent, which makes people feel very chaotic.

Not only in Tianjin, all KTV doors are transparent or have a transparent window, and they can't be locked, which means that anyone can come in at any time.

This is also a regulation of the public security department, because it is a night show after all, for fear that something beyond control will occur in it and the staff will not be able to enter the coordination.