One is a fox demon who has been practicing for thousands of years, and lost his lover and relatives because of the sins of his previous life; the other is the butterfly spirit who follows the fox demon, looking for his lost lover in the passage of time; the other is a mythical beast that lives for the contract, following its master through places. There is the most mysterious Xieyunju in the city, which is famous for its antique trading, but it is also this Xieyunju that hides the deepest secret in the city. Yinglong, a college student, has developed his natural inspiration since he came to Xieyunju, and he encountered many strange but ordinary things. What is hidden behind Xie Yunju? Did the legendary divine dragon and ghost dragon in Yicheng really exist? Everything is waiting for Yinglong to uncover the mystery...