This guide will list several hidden facts of the plot that you might missed, this helps you to connect (almost) everything in the game to reveal what really happens in the story.

WARNING: FULL OF SPOILERS!

It depends.

If you look carefully to the entry location and the layout of both restrooms you went into you'll notice that the latter restroom is actually mens' restroom which (with the few Wei's scenes before this) indicates that Wei is the one that takes the "snitcher"'s blame and bulliness even though Ray is actually the snitcher. It's possible that Wei intentionally chooses to hide the fact that Ray had previously requested the banned book list from him to the public possibly due to his affection to Ray.

The reflecting image of Ms. Yin that wears a hood is actually Mr. Chang, this indicates that Ray is actually uses the book list as a weapon to effectively killing Mr. Chang.

In the true ending auditorium, several developers has make fun with their names on the walls (the Chinese is called "自肥", literally means "make yourself fat/good")

• "我♥王光昊" at the rights stairway at the stage, id. est. "I ♥ Light Wang"
  
• "東^2打手槍" at the left side of the auditorium, side of the storage room entrance, "東^2" means "東東" and "打手槍" means a dirty slang of "men masturbating"
  
• ...

There's a "dickbutt" meme graffiti on the wall near the restroom entrances

Most players will missed examining the construction promotion banner in the first room.

• Some players will failed to noticed that there's new content in the notebook
  
• Some players noticed the notebook, yet failed to notice there's new content other than the "Amnesty Certificate"
  
• Some players noticed the notebook, notice there's new content other than the "Amnesty Certificate", but failed to notice that there's new pages after all the previous picked up pages, which is mainly Wei's reaction to those notes.

Some players will missed out part of Old Granny's dialog.

It's indicated that it was Ray that threw her White Deer Jade Pendant into the vent after snitching out the forbidden book club. Possibly after the "awarding ceremony" of her snitching she can't stand the guilt that she make so much people in serious trouble.