C47 Who?

At 3 in the morning, while everyone was sleeping soundly, Gu Xi sneakily dragged her suitcase into her 506. When she stepped into the room and pressed the door, she instantly let out a long breath. At least the night had passed safely.

He put the card on the table and turned on the light. Then, he saw that there were a few sheets of A4 printed paper squeezed into the crack of the door