In the Tang Dynasty, Princess Taiping had a dream of riding a "silver snow-white horse" galloping under the moon in a "dream of a fairyland." The female Taoist Xuanji interpreted the dream, explaining that the white horse represents a "celestial horse," and she made the princess's "dreams come true." Xuanji gained favor. At this time, the great Tang Detective Dee solved a "massacre case," only to discover that it was a tragic event caused by the "celestial horse."...

When he first arrived in Chang'an to take up his post, Dee witnessed a strange incident in the busy street: a unicorn with a burning fire all over its body, causing a big trouble in the lantern market of the Shang Yuan Festival and hurting many people. Dee saved a child and teamed up with the unscrupulous marshal Lin Musen to chase the fire unicorn, but the fire unicorn escaped. The Queen of Heaven, Wu Zetian, is furious and orders the Secretary of the Da Lisi, Xue Xin, to investigate the case. Through various misunderstandings, Dee and Xue Xin's daughter Xue Anan became a couple, but they now have to work together to investigate the case of the Fire Qilin. Dee finds a rare hairpin at the lantern market which leads to the clues to the residence of the King of Qi, which revealing the love story of the young prince Li Zhuo and the young dancer Murong Ling. As the investigation progresses, Dee finds that the case becomes more and more confusing, with the secret arts of the Western Tulip, the scourge of the extermination of the family ten years ago.........

The film starts with a series of farces caused by the accidental identity swap of two men who had nothing to do with each other. Xu Yi was originally a hobo in Thailand's Chinatown, who attributed his failure in life to luck and always complained about others. By chance, he swaps identities with jeweler Longshan and becomes involved in a fight between Longshan and the criminal gang Skull Buddha. Xu Yi eventually chooses to stand on the side of justice and brings the Skull Buddha gang to justice together with Longshan. He also recognizes his own flaws under the influence of Longshan and decides to face life with a positive attitude instead of complaining negatively even when he is at a low....