Shen Niantang paused while holding the pile of books. The walls on both sides of the corridor were peeling off badly, revealing the black cement underneath. There was a damp musty smell in the air, mixed with the smell of rotten wood unique to old houses. Are you sure this is here? She turned to ask her roommate behind her. Lin Xiaoxiao took a look at her shoulder, and the light of the mobile phone's flashlight flickered in the corridor: The navigation showed that this is the building, Room 302. You see, the house numbers are correct. The paint on the door is so mottled that the original color cannot be seen, but the three numbers 302 can be vaguely discerned. Shen Niantang looked closer and found a note stuffed in the crack of the door. She pulled it out and wrote on it in ballpoint pen: Classmate Shen Niantang, I have your student ID card. I want to take it back. See you in classroom 302 at eight o'clock tonight. No signature. Damn it, who is so boring. Lin Xiaoxiao snatched the note. The words were written like a dog crawling, and he was not a good person at first glance. Don't go, you can just go to the Academic Affairs Office to get a new student certificate the next day. Shen Niantang said nothing. She turned the note over, and there was a line of small words on the back: Don't you want to know what happened that night? My heart skipped a beat. That night. Of course she remembered that night. Three days ago, she and her roommates went to a bar to celebrate the end of final exams and drank a little too much. She couldn't remember much about what happened next. She only remembered that she left early alone, and then fell downstairs in the dormitory. When she woke up, she was lying next to the flower bed with her student ID card missing. But I always feel like something else happened.