When Lin Yao saw Chen Mu come out of the room, she became completely respectful. Having dared to be the way she had been toward Ah Sang, she didn't dare to be the same toward Qiao Yuan. Someone like Qiao Yuan, who had been the object of such powerful enticements from the school, was someone you would want to give a lot of respect to—at least on the surface.
The situation for each side was extremely subtle. Chen Mu was quite disgusted with Moon Frost Island, but he couldn't show any of that on the surface. He still needed to take advantage of his identity as Qiao Yuan to get into the household of the Tai-shus of Dong Rui. If he were to get into an open fight with Moon Frost Island, that identity would become useless. The Tai-shus of Dong Rui would never accept a card artisan with a grudge against Moon Frost Island, as would be the case with any clan that had any brains.