Yao Xianzi's teacher is a past strong expert who used his last ounce of strength 700 years ago to seal her and the others into the Ghost Tomb Space to save them from a cataclysm. He told her that if she ever meets a fated person with a Ghost Tomb Body, they must cherish them as that person could help unseal them. He is not present in the current timeline, but his words are critical to Yao Xianzi’s interaction with Jiliu Jia.
