Disguise

Soon after the four ran away from Xuan Yi's room, Ran Xueyi instructed them to find the kitchen and stay away from any mirror or cameras. Though she made sure to tell them beforehand, when they arrived at a hallway, several mirrors were hanging by the wall, making it really difficult for them to pass through it without being seen. 

"Why are we hiding from the mirror? Isn't the CCTV dangerous enough?" Xuan Yi couldn't understand why they had to hide from the mirrors. They're harmless, okay?

Ran Xueyi wanted to ignore her and continue running, but Xuan Yi might continue asking questions if she didn't answer. And so, she said, "The mirrors by the wall are all two-way mirrors that are just decorations but in truth, it's just another way to monitor our movements."

"What? Didn't that man tell us that there's no camera?" Xuan Yi was shocked.