200 million won for my sister’s repairs

(1)My sister bought a simple pool on the Internet and installed it on the roof of the villa
(2)After receiving about 8 tons of 8,000 liters of junk, I called my friends to have a barbecue and wine party, and the resident of the 5th floor of the house under the rooftop came up with a sound of something breaking from the ceiling;;
(3)According to the detailed explanation of the pool, it is 5 meters wide, 2 meters long, 85 centimeters high, 8,000 liters full of water, and weighs 8 tons
(4)So I called the owner, summoned the owner, drained the water, and contacted the district office for a safety checkup, and ordered reinforcement work and temporary relocation measures were imposed on residents on the fifth floor to complete the reinforcement work
(5)And the building office estimated 180 million won for reinforcement work, so my parents would pay for it, but my brother was responsible for it, but the construction work was poorly constructed so that the rooftop could collapse in the swimming pool
(6)There’s no fault of the house owner who didn’t tell the tenant that the rooftop was weak