Two pictures confirm my thoughts. I only have 600u and decisively took out 45u to short with a light position. Sure enough, a big drop occurred. In the first picture, it failed to break through 4500 for several consecutive days. Approaching 4500, there was strong resistance from the bears. The second picture shows a long upper shadow, where the bulls pushed the price up, but the bears pressed it down hard, forming this pattern. After waiting half an hour, I found that the bulls were unable to break through. I decisively joined the bears and got it right.