Lin Yuqing has practiced Xuanmen magic with her father since she was a child. However, after her father died mysteriously, she discovered that her bloodline contained the power to fight against ancient evil spirits. Agent Cui Mingyuan of the Special Investigation Team was ordered to investigate the case. While tracing the truth, the two accidentally opened a "gate" and were drawn into a different world with chaotic physical laws - the gap between Yin and Yang.
Here, memories will be tampered with, time and space are disordered, and only the "golden thread of life" can guide them to find each other. They discovered that Lin Yuqing's father, Lin Zhengguo, was not really dead. His soul was imprisoned by the evil cultivator Xuan Mingzi, and the key to defeating him was actually hidden deep in the blood of the two men.
As the investigation deepens, they uncover the secret from three hundred years ago: Lin Xuanshuang and Cui Poyun, the Taoist couple sacrificed themselves to seal Xuan Mingzi, but left behind the "Twin Lotus" as a back-up. Only descendants with the same blood can awaken its power. However, Xuan Mingzi has already penetrated into the real world, and his minion Chen Xuanli, who is half human and half demon, vows to prevent the two from completing their mission.
Trust is their only weapon; blood is their last hope.
When Lin Yuqing and Cui Mingyuan stood in front of the cliff of love, facing the final test left by their ancestors, they had to make a choice - should they repeat the same mistakes and give up love for the common people, or should they break fate and find a way to have both?
And in the darkness, a bigger conspiracy is brewing... The "Dark Abyss" awakens, the dragon clan returns, the spark is rekindled, and the seven seas are in turmoil.
