He actually seems like the kind of person who likes and prefers ambiguous relationships that can move in one direction one day and the other direction the next day. That is, benefits with no commitment. Previously it was said he just has difficulties in relationships because he's too nice toward everyone, but I'm starting to somewhat doubt that. If he was so nice, he would have accepted Mianhua's declaration immediately. Now it seems like he wanted time to figure out how to make Mianhua reverse her decision and return them to the old relationship, where nobody knows what it is, and thus Yifeng could potentially take advantage of Mianhua, should he ever feel like it.