When the little fox Yan Zifang was 1 year old, she met the human form of the Demon Lord and rescued him who was weak at the time. The Demon Lord repaid her kindness by giving her 50 years of spiritual power and promised to marry her 9,000 years later. Yan Zi, who didn't know what the marriage was at that time, ignorantly agreed and took off a piece of her own tail hair as a return gift. The two parted ways, and the little fox Yanzi embarked on her own path of cultivation...