- Shen Mu: The son of a family of military generals whom the Heavenly King relies on. He has a respected status. He has been guarding Wangchuan alone for three hundred years in order to recover his erased memories.
- Wang Chuan Jin: An ancient fallen angel with overwhelming demonic energy. He is wanted by the fairy world and has a deep obsession with Shen Mu that spans past and present lives.
- Qiu Zian: A young man adopted and educated by Shen Mu. He is extremely talented in swordsmanship, cold on the outside and hot on the inside.
- Mei Xiaobao: The only son of the Mei family, the second largest civil servant in the Heavenly Realm. He behaves in a flamboyant manner and seems difficult to get along with, but in fact he has a clear distinction between right and wrong. He has a very high IQ. Because of his outstanding family background, others are either jealous or fawning over him. There are very few people who truly know him.
Purpose: Inspired by the fateful entanglement between the two gods in heaven, the story tells the story of Shen Mu, who protects his best friend Wangchuan Jin, uses his immortal body to block the attacks of the immortal gate, gives birth to a demonic heart and falls into the devil's path, and uses the blood of his heart to detoxify it. In the end, the two of them step into the demon clan together, and in the desperate situation of the confrontation between immortals and demons, they write a story of deep love and redemption that spans life and death and breaks the boundaries.