Ep 9 is such a satisfying watch between Mu Dan and Chang Yang. They really are perfect for each other. She's so good at persuasion, and talked him into taking win-win business collaborations. There are moments you can just see the admiration on Chang Yang's face at seeing how Mu Dan turned a disadvantage situation to her advantage.
What does her new name mean? Jiang Xiaohua? Why did it look like she was not happy with it?
Not only did he give her his last name, he also named her aptly because "xiao" is almost like a term of endearment. It's a play on words here with some hidden subtlety. Think of it as she belongs to him. =)