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The name of this novel may be The Legend of the Castle Peak Fox. The Legend of the Fox in Qingqiu is a fantasy novel created by online writer Tang Qigong. In the novel, the hero is an ordinary person who doesn't want to get involved in the dispute of cultivating immortals, but he is accidentally chased by monsters. Later, he met a fox, experienced various twists and turns together, and finally revealed various secrets. The plot you described is close to the beginning of the novel. Taoist priests sacrificed to seal the demon and sealed it on the man. After many twists and turns, the hostess finally became the spiritual hostess of the Qingqiu fox family.