Zhu Pingniang deserves to be called "Senior" and thanked by Xu Chang'an, not to mention that she really treats Xu Chang'an well. Just think, when he killed the Cyan-eyed Tiger, the first person he thought to seek help from was Miss Zhu, who agreed to help without any hesitation.
Though Zhu Pingniang never mentioned these things herself, does Xu Chang'an still not know?
Therefore, he always regards this Miss Zhu, who seems full of flaws, as a senior worthy of respect and gratitude.
Now, knowing she is the sister of his teacher, the senior directly becomes an elder.
That's why... Xu Chang'an feels a peculiar sensation akin to reporting his cultivation progress to his family when he's planning to bring Yun Qian back to Beisang City to meet Zhu Pingniang. It's very subtle.
Hmm.