1. The Korean cryptocurrency market exploded last night. After the South Korean president announced martial law, the exchange Upbit had problems. Bitcoin and altcoins crashed to below $72,000, which was a rare plunge.

2. Upbit "pulled the plug" to stop trading, raising questions about whether it was a technical failure or a dark market operation, highlighting that the security of funds in opaque exchanges is not guaranteed, and you should be cautious when choosing a platform.

3. There are political factors behind the plunge. If the policy continues to be tight, the pressure on South Korean crypto assets will be greater.

4. This plunge has brought opportunities to the "brick movers", who can use the price difference between South Korea's low price and other countries' markets for cross-border arbitrage. South Korean Bitcoin is now as low as more than $70,000.

5. It is recommended to choose stable and reliable platforms such as Binance and Coinbase. At the same time, you should remain vigilant, avoid risks, invest rationally, pay attention to policy changes, and control risks to obtain stable returns in a turbulent market.