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.