Yesterday was supposed to be a huge day for Krafton, the South Korean gaming giant behind everything from [TERA](/tag/tera) to [PUBG](/tag/pubg) , as it launched its initial public offering. As GIbiz notes, its IPO share price was 498,000 KRW (about $430 US), but as the market opened, shares were already trading down 10%, sinking to 20% down at one point before rebounding and putting the company’s valuation at just under $20B US. So what the heck happened? South China Morning Post attributes the rough launch to that whole “ spiritual opium ” thing from last week, when a Chinese state…