TV drama screenwriter Zhou Shijie (Jet Li) is divorced by his wife Monica (Rosamund Kwan), and he starts to write the script of the TV series "The Adventure King" in a depressed mood. He imagines that he has become the adventure king Wei Yixin in the Republic of China era, and Monica becomes the Japanese spy Mikako to vent his depression. The wordless scripture obtained by Tang Sanzang in the West and now missing has become the target of competition between the Chinese and Japanese governments. In order to prevent the Japanese from getting there first, the Chinese government invites archaeologist Wei Yixin and his apprentice Bao Jiaoxiao (Takeshi Kaneshiro) to track down the whereabouts of the scripture. They learn that the clue is on the surface of the scripture box. The two sneak into the Japanese consulate and meet the mysterious beauty Mikako. Later, the two follow the clue to a certain newspaper office and learn the whereabouts of the scripture box from the editor Yingshu (Law Kar-ying), but the news is also known by Mikako.