The northern border has been invaded by demons all year round. The imperial court emphasizes civil service over military affairs, and the generals are in decline. Military power at the border is divided between local military leaders and civilian forces (such as Yan Yunqi).
- The critical point between humans and demons: "Forest of Eternal Night" is the border zone between demons and humans. The elves were once neutral guardians, but later fell to the demons due to internal divisions, becoming the trigger for the war between humans and demons.
- Special settings:
- "Poison Curse Red Eyes": Yan Sha's red pupils are cursed by the demons' secret magic. The five senses are strengthened but at the cost of pain. At the same time, they can temporarily see through the demons' illusions;
- "Half-demon elf": Riad's body will switch between "elven form" (pointed ears, weak healing power of light) and "demon form" (bat wings, black magic) according to her emotions. Part of her memory will be lost when switching between the two forms.
One sentence summary: The red-eyed iron knight who was abandoned by his family, and the half-demon witch who was betrayed by the tribe, changed from sworn enemies to symbiotic in the war between humans and demons. While killing demons and defying the court, they opened each other's wounds to piece together their complete selves.
