Others might not have noticed it, but Leon did. There was a slight change in Amber's voice and tone when she addressed Wei Xiao. Even the way she looked had changed.
For others, she was always rude like this not because she was intentionally doing that. It was just her nature. She didn't care about anyone's opinion, so she never bothered to be polite with them.
It was an indifferent kind of rudeness.
But this time, it was intentional. It was directed at this man named Wei Xiao. Leon knew him too, as one of the few renowned A-Rank Alchemists. He was from the Great Wei Clan of the Shenyuan Sector.
And the Wei Clan was known for producing many geniuses in the field of research and development, which also included the medicinal side, so it wasn't surprising that someone like Wei Xiao came out of that clan.