The world might think Xinghe was a very capable woman and she got where she was on her own, some went so far as thinking Mubai was not good enough for her. However, it only took Xia Wa one glance to know it was Mubai who completed Xinghe.
He was not a common man, he was one with great wisdom. If he did not understand Xinghe, he would not have supported her so quietly and so unconditionally. It was because of his silent sacrifice that Xinghe could achieve what she had.
There was another person who understood this: Xinghe. If the one person who understood her perfectly was Mubai, then she was, in the return, the one person who understood him perfectly.
"It is she who completed me," Mubai replied with a smile. "Without her, I would not have known so many facets of myself and discovered myself."
It was Xinghe who had made him see what he needed.