The leverage bull market played by South Korea seems to be the big A of 2015 South Korea is personally demonstrating how a booming AI bull market can be leveraged into a major financial accident. In order to pull retail funds back from the US stock market to South Korea, regulators hastily approved individual stock leveraged ETFs from Samsung Electronics and SK Hynix. After the product was launched, the scale of retail investors entering the market quickly surged to a record high of 60 trillion Korean won, and over 350000 people queued up to complete leveraged ETF training. Samsung and SK Hynix account for more than half of the market value of the South Korean stock market, coupled with a double leveraged ETF, the entire market has almost become a big gamble around the two chip stocks. When it rises, everyone feels like they have caught up with the AI era. When the leveraged ETF falls, it is forced to sell, and the selling continues to hit the market, causing the stock price to fall and become more stable. The KO-S-PI index has experienced multiple major drops, with a daily drop of 8% already considered normal. SK Hynix has experienced a record breaking 15% drop in a single day. The most ironic thing is that the head of the South Korean Financial Supervisory Agency later publicly admitted that the approval of leveraged ETFs was too hasty, and even said that he "should have been lying on the ground to stop it" at that time. Now the regulatory authorities are preparing to tighten the rules again. The bull market attracts everyone in, leverage is responsible for making them believe that they can really get rich this time, and regulators usually wait until someone pays the price before starting to apply the brakes. What Korean retail investors are currently experiencing may be what all AI concept stock investors should understand in advance