$LUNA Recently, the biggest "black swan" in the history of the cryptocurrency world broke out. The LUNA coin, which once had a market value of 41 billion US dollars and had hundreds of thousands of fans, plummeted one after another. In just a few days, the price dropped from nearly 90 US dollars to the current 0.00017 US dollars, almost to zero, and the market value of tens of billions of dollars evaporated in an instant.