According to a search on Sohu.com, we learned that the movie adapted from the Liyuan Underground Palace Case is titled "Detective Detective Dee: The Murderous Case."

"Detective Dee: The Murderous Case" is an action-adventure film produced by Beijing Zizai Tiancheng Culture Media Co., Ltd., directed by Tsui Hark, and starring Zhao Youting, Zhang Zifeng, Lin Gengxin and Andy Lau. The film is adapted from the Detective Detective Detective series. It tells the story of a fierce battle between the Tang Dynasty and the Turks, and wars raging across the border. Empress Wu Zetian (played by Andy Lau) sends Di Renjie (played by Chao Youting) to investigate the conspiracy behind the wars and find out the mastermind behind the wars.