Looking at the shiny crystal on the mahogany lamp holder, Han Wenyue couldn't help sighing in her heart. As he was lost in thought, the door behind him was closed with a squeak. Han Wenyue was secretly surprised. She remembered that the door of a church was the same. She did not pay attention to it at that time. "This door is really strange. Is it controlled remotely?" Rowling smiled. "Of course not, all living things that enter the fourth level, well, this metaphor is not very appropriate. That is to say, whether human beings or demons, there are only two ways to enter the fourth level, forward or backward. When you open a door, you can only choose to enter. The door will never close before you enter. Of course, if you want to go in or go out, the premise is that you need a key." Rowli

