The play tells the story of Xiao Pingjing, who was studying in Langya Pavilion, investigating the case of his brother, Xiao Pingzhang, deputy commander of the Lin Army, and involving the safety of Daliang. The Daliang court was stable, but the border war continued. The Changlin Army, which guarded the northern border of Daliang, has repeatedly won military merits and is famous. In a battle in the northern border, the cabinet chief Xun Baishui secretly cut off the front-line supply. In the battle, Xiao Pingzhang (played by Huang Xiaoming), deputy commander of the Changlin Army, was seriously injured. His younger brother Xiao Pingjing (played by Liu Haoran), who was studying in Langya Pavilion, heard the news and went down the mountain to investigate the case. Thirty years ago, the neighboring country Yeqin suffered an epidemic. Daliang sealed the national road to protect itself. Puyang Ying (played by Guo Jingfei) lurked in Daliang because of the hatred of destroying the country, and colluded with the first master of Langya List, Mo Zibo, the lord of Donghai, to secretly disintegrate the power of Emperor Liang and Changlin Mansion. The two poisoned everywhere in the capital, and the epidemic spread rapidly. Puyang Ying set up a bureau to poison Xiao Pingjing and Xiao Pingzhang one after another. At this time, the northern border was in danger. Xiao Pingzhang gave up treatment and rushed to the front line to support, but died of poison. A year later, Emperor Liang died and Dayu invaded Daliang. Xun Baishui and Laiyang King Xiao Yuanqi (played by Wu Haochen) tricked the young Emperor Liang into issuing an edict to ban troops from the border. Xiao Pingjing disobeyed the edict and defeated Dayu. The Changlin system was abolished. Xiao Yuanqi secretly colluded with Mozibo Hou and betrayed the country. In the crisis, Xiao Pingjing raised an army to serve the king and rushed to the battlefield to rescue Emperor Liang.