Biotech Sector CrashClosingBellLiveHwang Yoo-hyunKOSDAQ WeaknessKOSPI Reboundmarket volatilityMay 18 2026Safety MarginSamsung ElectronicsSK HynixYeom Seung-hwan 18 5월 2026 [May 18, 2026] KOSPI Market Wrap-up: In-Depth Analysis of Samsung Electronics and SK Hynix Strategies and the Impact on the Bio Sector 서울특별시 Yeouido Introduction On May 18, 2026, the South Korean stock market experienced significant volatility. The…