Someone made 1 million in a few days with a 100,000 yuan contract, but didn't want to stop. He stopped when he made 2 million. When it reached 3 million, he thought about 5 million. But before it reached 500, his luck ran out and he started to lose money. He returned the profit to the market and lost the principal. He even had to continue to borrow money to make it back. As a result, he entered a vicious cycle and got deeper and deeper.