The demon "Ghost Butterfly" who committed a series of murders reappeared after a long silence. This time, in addition to the victim woman, the famous Frost Sword Ranger Jing Haofeng was also killed at his hands;
Zhen Yu, a disciple of Zhuomen, was ordered by his teacher to assist Liumen in tracking down the "Ghost Butterfly". Unexpectedly, the seemingly simple case was shrouded in mystery. Zhen Yu always lingers outside the truth and has difficulty getting to the core of the case. In desperation, she has no choice but to ask for help from her friend Hua Xuan, a disciple of the Gouzhen sect;
The craftsman Liang Yuqiu appears to be an ordinary, lonely, paranoid, and detached from the world, but in fact he hides a shocking wisdom. He played an unexpected role in the "Ghost Butterfly" case. It was the shocking mystery he created that turned all investigators into puppets.