Xiao Wen helped Yiren by removing the excess amount of alcohol from her with the regeneration ability she had, but that's all she could do. She couldn't stop Xuefeng from doing naughty stuff with Wuying even if she wanted to even more than Yiren. Xiao Wen wouldn't mind if he let them join though.
The problem wasn't that he did so, but that Yiren was still at the banquet with many people present. Xiao Wen and Yiren even considered leaving until everything was over but just at that moment, Red Rose who was busy socializing with other big investors, finally found time to approach them.
Seeing there was no Xuefeng with them, she behaved much more casual and asked, "What's up? Where is Young Master?" She would be much more respectful if she knew Xiao Wen's origin but Xiao Wen wasn't in a mood right now to argue with her.