The Scum Is Entrusted 

Wen Yan turned to look at Fei Yinzi. "How come you are here?" he asked. Then, he made a pause. Thinking that his question was too aggressive, he changed his tone. "Welcome back." He said and patted Fei Yinzi's shoulder. 

Even though he has already guessed what is going on between his younger brother and Fei Yinzi, and he doesn't like it, Wen Yan cares more about their bond as disciples. Fei Yinzi as a person is okay to him, but what Wen Yan doesn't like is Fei Yinzi's relationship with Wen Wen. Wen Yan is not against cut sleeves, of course, since he also is one and he is even in a relationship with Zhu Xi. 

But, what Wen Yan doesn't like is that a pig snatched his family's cabbage*! (fig. someone unworthy took away someone who you nurtured aka. your family member)