Maksim have not accepted Wu SuYi and he didn't see himself ever accepting her. But he slowly learned that it would be better to trust her rather than putting her away when she seemed to be more useful. As she said, there was no advantage for her to betray Han XiGuang.
"Our sir had been a mature child since he was younger," Maksim said even though he didn't personally know Han XiGuang when he was young, the story of his matureness that set him apart from his peers had been known by everyone. "There was a time when he had put his trust to the nanny who had brought him up. As Senior Mr and Mrs Han are both busy people, they often left Sir Han to be with the nanny but he never expressed his loneliness. He even said that he didn't mind it as his parents would always be there in times he needed. But the nanny was more than a friend to him, more than a mother figure, just someone he knows he could put trust on."