The 519 black swan event in 21 years. All I remember is that it was a sad story. The peak of the pie rose to 64,000 knives, and in the two days of 519, it was cut in half to 28,400 knives. I also had a fluke mentality. I made a lot of money from short selling at the beginning, but later I didn't expect that the price would fall below half of the price in a short period of time. I have gained experience and don't bet on the rebound in the downward trend and bet on the bottom. Except for the 312. It was a bit incredible at the time. Old people who have been in the industry for a long time know this, but I wonder if you made a profit or a loss at that time?