This family didn't see eye to eye with the real estate developer on relocation compensation terms and didn't want their private property to be pulled down. They were called “Nail Household”, meaning they were as firm as a nail that didn't want to move a bit.
In order to prevent their house being pulled down by force, they piled up gas cans, petrol and firecrackers on the third-floor balcony where Grandma took defense with a torch in hand.