The Xia Family has been fighting with Master Ma for over twenty years, how could they not know that Master Ma is just an alias?
That's right, it really is an alias. Don't be fooled by the fact that he's a master, using an alias in society is quite normal.
Master Ma doesn't use his real name, not only because he doesn't want to trouble his family but also because he wants others to fear him more—a master whose origins are unknown is someone people generally avoid provoking.
So the moment Xia Ziling heard Feng Jun say he knew of the other party's origin, her attitude immediately changed.
She has already expressed where her hatred for Master Ma stems from: not just because he killed her father and brother, but because he's been continuously putting enormous pressure on the Xia Family for over two decades.
