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.........