"Shadow" is a martial arts action film directed by Zhang Yimou. The film tells the story of how a person who was trained as a stand-in from an early age struggled to survive and regain his freedom. In the era of wars and strife, there are many heroes fighting for deer and wolves. Peiliang, the king of Peiguo, always seeks stability and is afraid of chaos. In order to preserve his own glory and wealth, he does not want to meet swordsmen with neighboring countries. However, the neighboring Yan State took advantage of the vacancy and seized the important border states of Pei State and did not return it for a long time. The governor of Pei Kingdom, Ziyu, led troops to the conquest, but was injured by the opponent's general Yang Cang. Jing Zhou was Zi Yu's substitute trained since he was a child. Back then, Zi Yu's father was assassinated, and his uncle was worried about Zi Yu's life, so he searched all over the world to find a boy who was exactly like Zi Yu. At the same time, in order to appease Yang Cang, Pei Liang actually promised his younger sister to Yang Cang's son as his wife, so as to avoid war with relatives. In this way, Jingzhou struggled to survive between the war and peace between the coach of Peiguo and the lord