Selling a put option, for example, at a spot price of around 70,500, and then selling a put option at 69,500, even with a full margin of 70,000 plus the premium, and even if the final price is 69,500, there's still a risk of significant loss due to the rapid price drop in the short term. Forced repurchase of the put option to close the position, however, could result in very poor liquidity and high slippage, leading to substantial losses. Selling a put option corresponds to buying low in both currencies; the potential profit is greater than buying low, but the risk is also much higher.