Director Chen Kuo-fu thoroughly understood all the Chinese and foreign story versions of "Di Renjie" in the preparation of the film, and made a fit design of "007 plus Li Bai" for the character of "Di Renjie", and used "clone technique" to deeply understand "Di Renjie" , "The character'Di' is chivalrous tenderness, and'Benevolence' is the most emphatic sentiment of the Chinese, so his weapon is not sharp, representing his benevolence. The right half of'jie' in traditional characters is The'Jie' of'unruly and rebellious' represents the spirit of rebellion." In Chen Kuo-fu’s mind, this movie must have "fearless courage and steadfast faith", with both reasoning and lyricism. He believes that only Hark Tsui can meet this requirement, and only he can make it. That kind of imagination and feelings, so Chen Kuo-fu found Hark Tsui for the first time, and simply said, "Let's take this one", and the curtain of cooperation with each article and one weapon began
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In the process of creating the script, Chen Kuo-fu found a partner Zhang Jialu who had cooperated with him for many years. "Detective Dee and the Mystery of the Phantom Flame" is the work that tortured them for the longest time. Generally, a screenwriter’s project is as fast as three or four. Month, the slowest one or two years is the most, but the script of "Detective Dee and the Mystery of the Phantom Flame" has gone through 10 years. Even in the filming process, the script is still being revised, Zhang Jialu can only live in Hengdian, the shooting location for a long time. Among them, Zhang Jialu contributed a weird ghost market concept to "Detective Dee and the Mystery of the Phantom Flame", and Hark Tsui proposed to build an illusory Buddha statue in order to restore the prosperity of the Tang Dynasty
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