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Who will explain the dialogue between Song Siming and developers about real estate in My Dwelling House and how to speculate on real estate?

After deducting the cost, the company sold the house at the price of100000 yuan, and has made a profit. So if I sell it at 6,543.8+0.25 million yuan with a down payment of 20%, I can get a loan from the bank to 6,543.8+0.5 million yuan. Have my cost and expected profit objectives been achieved? Next, I will slowly return the monthly payment to the bank, so that I have both money and time at hand. I can put the house on hold and sell it slowly, or I can use the money at hand to invest in other things. Even if one day I don't give all my monthly payments to the bank and let it take over the house. When the house price is low, banks will only recover bad debts at a loss, but when the house price is good, why should I worry about not selling the house?