The Mysterious Red-Clothed Saleswoman

Our school is a foreign language institution, and at times, there's a recurring incident at night where a woman in red clothing comes to our doors for sales. It's unclear how she manages to evade the checks at the entrance. Every night, she visits, knocking on room after room. If someone answers, she asks, "Do you want red clothing?" Due to the disturbance, the female students become quite irritated and vehemently refuse night after night.

One evening, the same woman showed up again. Knock, knock! This time, when the door opened, a female student burst out and shouted at her, "Red clothing? I'll take it all. How much?" The woman smiled, turned away, and didn't provide her any red clothing. That night, everyone slept soundly, and no one came knocking on the doors again.

The following day, everyone in the dormitory had woken up, except for the girl who had yelled at the red-clothed woman. Her roommate lifted her blanket to find that she was completely covered in red. The skin on her upper body had been peeled off, and her entire body was drenched in blood, making it look like she was wearing a red outfit.