C734 Black Sand?

Su Lya felt that Lu Qianqi's deduction was valid. She remembered that when she saw Mu Lancheng, his mood fluctuation was definitely not something that could be displayed just by acting. He must have felt anxious and uneasy, and even felt guilty towards Mu Lancheng.

He was indeed Mu Xiang's junior brother, and was also indeed very respectful towards his own senior sister at that time