Recent market action in South Korea isn't a direct cautionary tail for what can go wrong with leverage, but it's a good reminder to pay attention. Here's the headline: On June 23, 2026, U.S. semis took a big hit, for no U.S. reason at all. Big memory plays Samsung Electronics fell 12.31% and SK Hynix fell 12.47% in their worst 1-day showing since the 2008 financial crisis. The KOSPI dropped 9.99%.