During the Ming dynasty, executioner Sei Hoi (Sunny Chan Gam Hung) and his god-brother, Shui Yu Chan (Michael Tse Tin Wah), a doctor, accidentally enter the town of Cheung Lung. Cheung Lung appears to be a happy and peaceful place. However, underneath the facade, it's hiding a very big secret.

The brothers meet the town's wealthiest man, Fok Tin Ming (Ngok Wah), as well as his stubborn and unreasonable daughter, Fok Sin Yiu (Bernice Liu Bik Yi). By mistake, Hoi and Yiu get married and become husband and wife. Suddenly, a number of murders happen in the town. While investigating, Hoi discovers that he and Chan are being caught in a trap. It turns out that there's someone behind the scenes pulling the strings. But, who is it? Is it a god? A person? The unknown causes immense fear in people...