Based on the Chinese folk hero Di Renjie, popularized in the West by a series of detective novels written by Robert Van Gulik, who called him "Judge Dee".
One of the sculptures was a 80-meter bust of Empress Wu Zetian, a key element of the film that cost $12 million to design and decorate. During production, reporters were invited to enter the bust's interior, which included a 12 meter tall circular platform. Outside of the platform hung red and white drapes that were full of scriptures.
The stunt team built eight platforms (12 meters tall) in the cave for three days of wire work. The record was over 70 wires for one scene.
Filmed at Hengdian World Studios in Zhejiang, China, which is one of the largest film studios in the world.
For the lead role as Di Renjie, Hark Tsui originally had 'Ka-fai, Tony Leung', along with 'Chiu-Wai, Tony Leung' in mind.