Previous life (an evil fate): He was the revengeful prince who was destroyed by the previous dynasty, and she was the female general who was ordered to guard the border. The two fell in love on the battlefield, but they had to draw swords against each other because of the blood feud between their family and country. In the end, she died to protect him from being pierced by thousands of arrows. After killing his enemies and taking back the world, he jumped into the abyss with her body in his arms.
This life (childhood sweethearts, fateful showdown): She was reincarnated as Shen Duge, the noble but sickly eldest daughter of the Duke of Zhenguo; he was reincarnated as Rong Jiusi, the scheming young proton prince who was dependent on others. The two grew up together in the Duke's Mansion. They had no wives, but when they became adults, they each awakened the memories of their previous lives.
In this life, one of them is the leader of the secret guard who must protect the motherland, and the other is a power-seizing chess piece tasked with restoring the clan. The blood feud in the past life and the opposition in this life made them step by step towards the abyss of sadomasochism of falling in love and killing each other amid push and pull, suspicion, possession and deep love.