In Hong Kong in the late 1970s, strange things happened frequently in the Kowloon Walled City, Sham Shui Po and Yau Ma Tei.
Detective Qin Ling meets Lin Xiaofeng, a girl who understands metaphysics, and a series of bizarre and murderous cases occur one after another.
The actress in red, the secret of the ancient well, the curse of copper coins... Behind every mystery, there are ancient grievances.
The unit solves the case + the main plot foreshadowing, revealing the unknown dark secrets of old Hong Kong.
