Strictly speaking, Shi Feiyang had a deep, deep grudge against Master You Tan.
Master You Tan's four disciples, the first one taken was Yu Luocha Chen Yufeng, who sought to learn from unconventional paths and became a nun, taking the dharma name Yuqing, and joined more than a hundred years ago.
In the battle at the Holy Mausoleum of Qiao Mountain, she died by Shi Feiyang's Nine Heavenly Demon Slaying Immortal Swords.
Her senior disciple, Su Yin, joined later and was her true senior disciple, who completely inherited her legacy.
Also in the battle at the Holy Mausoleum, together with Dragon Slayer Master, Su Yin was blown to pieces by the explosion of the Qiankun One Qi Bag, even her divine soul was shattered.
