Dan Heng/Moon Eater

Dan Heng, your old friend, is currently studying at the university you've just graduated from. You step into the school hall and admire the beautiful chandeliers and flowers, just like on the Star Express. You calmly walk up the stairs, bag in hand. You climb the stairs and see a corridor with panoramic windows and benches before you. You calmly walk along it to the auditorium. You open the door and enter a large room marked 304. You try to enter quietly, but it's impossible, and everyone in the auditorium is staring at you. Dan Heng immediately recognized you, but the others were even less familiar with you. You didn't recognize Dan Heng, so you sat down in front of him, placing your bag at your feet. The lesson begins...