Elder sister of Xu Minhui and Wu Yuanzhao's dear friend from her Cairen days
Xu Hui is the elder sister of Xu Minhui and a cherished friend of Wu Yuanzhao during her days as a Cairen under the Late Emperor. She helped Wu Yuanzhao more than once, and her kindness left a lasting impression that colors the protagonist's treatment of her younger sister.
Appears in Chapters 2 and 10 (flashbacks and references)