LAI is employed by CHUNG HING village to improve their 'Fang Shui' and to break the 'Fang Shui' of their neighbouring village LUI KUNG village. So, LAI sets off with his wife CHING. On their way, they meet with HUNG, a female geomancer, who is also employed by LUI KUNG village for the same purposes. Geographically, Lui Kung village shapes like a 'frog'. There are two alternatives to break their 'Fang Shui': 1) to build a road 2) to build an ancestral temple in the shape of a 'crab'. LAI suggests using the second method-since it brings less consequence. However, the Chung Hing villagers insist to use method 2. In anger, LAI leaves. Hearing that LAI has left, HUNG asks someone to have the "crab's" roof painted in red. The 'crab' now becomes dead.… ...

LAI asks the villagers to have the roof re-painted in green to revive the 'crab' HUNG is really quick at response. She immediately orders for the construction of a chain-like bridge to lock the 'crab'. Since then, the Chung Hing villagers become fatigue and cannot work. LAI thinks hard but still fails to make a way out. He becomes very depressed. While all villagers from both villages are gathering on the bridge to enjoy the full moon on Mid-Autumn Festival night, LAI suddenly asks someone to stick a pole in the water. The pole looks like a key to open the 'chain'. HUNG is stunned.