In the previous life, Shen Yanqiu, the daughter of General Zhenbei, was betrayed by her sister Shen Mingzhu and her fiancé King Jin, and she fell off a cliff and died in anger. When she was reborn, she was shocked to realize that she was actually a "human-demon hybrid" that had never been seen in a century. She had the blood of the demon king flowing in her body, and she was also responsible for guarding the balance between the human and demon worlds. At the same time, Xie Chengyu, a powerful official with a gentle appearance, is actually a descendant of a family that hides in the world of monster hunters, secretly investigating a shocking conspiracy that spans the two worlds.
During the day, Shen Yanqiu is the noble daughter of the Hou family, and she joins hands with Xie Chengyu in the court intrigues; at night, she transforms into "Qingluan", the guardian of the demon city, and confronts Xie Chengyu as the "Celestial Master". During the investigation, the two discovered that the betrayal in the previous life was intertwined with the demon clan's civil strife and the human race's power struggle. The mastermind behind the scenes actually tried to provoke a war between humans and demons in order to seek eternal life.
In the extreme pull of double life, Shen Yanqiu and Xie Chengyu went from confrontation to trust, from use to deep love. When the truth emerges, they must not only face the demon race's prejudice of "pure blood supremacy", but also resist the pressing pressure of the human race's powerful officials. In the end, the two fought for their lives, washed away the barriers between the two worlds with blood, and were reborn in the flames of war, achieving a redemptive love that transcended race and hatred.
