Duanmu Yi didn't quite understand at first what her mother meant, but then she revealed a shocked look of understanding as it clicked in her head.
She looked down at Lin Fan and then looked back at her mother before she was about to say something. However, before she could say anything, her mother covered her mouth again.
Duanmu Ming Yue gave a gesture to be silent before pulling Duanmu Yi out of the room. Then she said, "Even if I gave them a drug to help them sleep, it won't be good if you make too much noise."
That was the reason why Duanmu Yi was even able to sneak into Lin Fan's room in the first place.
If it wasn't for the drug that Duanmu Ming Yue had put in their food, it would have been impossible for her to sneak into the room of these cultivators.