### Outline of the novel "Song of Everlasting Sorrow: The Prisoner of the Demon King"
#### 1. Core settings
**Worldview Framework**: An imaginary fantasy dynasty called "Da Li". The court is controlled by powerful ministers, and there are remnants of the demon sect in the world. Demonic energy is regarded as heresy, and once contaminated, one will either die or go mad.
**Character Profile**
- **Cang Wuxi (Attack)**: The son of the former leader of the demon sect, he is burdened with the "blood of the devil" and has a violent and unruly personality. He will definitely retaliate. His family was destroyed when he was young, and he was imprisoned and trained by Chu Qingyun for ten years. He regarded Chu Qingyun as his sworn enemy, but he also developed a twisted possessiveness in his hatred.
- **Chu Qingyun (received)**: The prime minister of the dynasty was cold and ascetic, with power over the entire government. On the surface, he appears to be a loyal minister assisting the young emperor, but in fact, he is the executioner who personally destroyed the demon sect. He spared his life in order to suppress some kind of more terrifying "curse of national destiny". For this reason, he did not hesitate to feed the devil with his own body and bear eternal infamy.
**Core Conflict**
- **Clear Line**: Cang Wuxi returns with revenge and vows to kill Chu Qingyun, but discovers the secret of Chu Qingyun's body in repeated confrontations.
- **Hidden Line**: There was another hidden story behind the massacre that year. In order to suppress the demonic nature of destruction in Cang Wuxi's body, Chu Qingyun used his own flesh and blood as a "container" for ten years.
**Emotional tone**: Falling in love and killing each other, robbing and chasing his wife in the crematorium, extreme pulling and deep sadomasochistic love.
Purpose: To explore the ultimate "redemption" and "fulfillment" - to break the binary opposition between good and evil