Weird Story About Rules: I'm Not a Girl

On the first day of school, the dormitory aunt gave me a note: "My child, remember the rules of Building 7: [First, after midnight, if your reflection in the mirror of the water room smiles at you, don't respond. Close your eyes immediately until the tenth heartbeat from the bottom. Second, if your roommate gets up in the middle of the night to comb her hair, and her hair starts to turn red by the third comb, please pretend to be asleep and don't let her find out that you are awake. Third... And most importantly, never look for 404 dormitories. "