During the Republic of China, rumors that the ancient Shu Kingdom's treasure map was lost in the Ximianqiao Prison in Rongcheng were rampant, attracting the covetousness of various forces. In particular, the foreigners directly put pressure on General Wu, the governor of Rongcheng, to seize the treasure map. In order to prevent the treasure from falling into the hands of foreigners, the students of Rongcheng Academy formulated a treasure-grabbing plan. Student Xu Jiaxing forged a crime and tried to sneak into the prison to secretly investigate the whereabouts of the treasure map. Unexpectedly, he was replaced by his brother Xu Jiahe, who was eager to protect his brother. Xu Jiahe had the ability to escape from prison, but after learning his brother's true purpose, he had to get involved in the fight for the "treasure map". However, the identities of the death row prisoners were each a mystery, and the situation inside and outside the prison was unpredictable. The two brothers experienced life and death several times, and were surrounded by dangers. In the end, Xu Jiaxing and Xu Jiahe worked together inside and outside, and with the help of other patriots, they finally succeeded in finding the treasure map and protecting the national wealth.