In the twelfth year of Jinglong's reign, Su Ci, the chief arrester of the Ministry of Punishment, was ordered to investigate the corruption case of the disaster relief bank. However, he and the border commander Xie Zheng, who was escorting the evidence, were involved in the mystery of the former dynasty's jade seal. When the fierce female detective discovers that the truth about her father's death in battle is actually related to the Xie family's military report, and when the iron-blooded general has a difficult choice between the emperor's order and his conscience, a broken sword engraved with "Mountains and rivers share the same sorrow" leads to the secret of the emperor's heir twenty years ago. From the Qingzhou water transport massacre to the explosion in the underground palace of the Imperial Tomb, the two people who were suspicious of each other walked on a knife's edge. In the end, in the flames of the imperial city's rebellion, they verified the most impossible feelings in the most tragic way.
