Woofun AI reports that SK Hynix and Samsung Electronics experienced significant price drops in extended trading sessions while the KOSPI remained closed for Constitution Day. S&P 500 double-long instruments for SK Hynix fell 17.8% at the Hong Kong market open, with Samsung dropping 14.7%. BIT data indicates Hynix ADRs initially plunged 13.69% following the U.S. market close before stabilizing with a 1% rise in after-hours trading.