On May 19, 2021, there were many people who jumped off buildings because of losing money overnight. I have been in the cryptocurrency circle for 6 years, and have done spot, contracts, issuing tokens, doing trading, etc. Each of them can make you rich or make you lose everything. On May 19, I lost 150,000 U in a certain cryptocurrency exchange and the network cable was directly unplugged. Haha, I just closed myself up. I made a lot of money and lost a lot of money in those years. I have started to do contracts again in the past two years. Some advice to friends who want to join the circle or have just joined the circle, don’t gamble all your wealth on tomorrow. If you have spare money, maybe one day the cryptocurrency circle will really let you retire directly. If you lose money, at least it won’t affect your normal life.