"The time-space of the Outer Dimension is not stable, being influenced by both the Real World and Dreamland, as well as other higher dimensions."
"The first time you all entered the school, it was at night because you knew nothing about it, and you had no clear concept in your minds. 'School' was just a place your subconscious associated with where you believed you were, so it manifested as a school."
"When you entered the same dimension for the second time, including those students who hadn't awakened yet, you all had the concept of a school in your minds, and that's why the darkness disappeared. To summarize, what you saw was what you wanted to see."
The next day back in reality, Nurse Liu answered all of Wang Yunxiao's questions in class.
"Why do I say this dimension is relatively safe? Because you were the first ones to enter, what this dimension specifically shows in terms of structure and scene entirely depends on your own recognition."