Title: Oct 21, 2026 [NewsDomino] A Day After the Plunge, a Buy Sidecar▸ The news, in one line Korea's KOSPI fell 3.73% on October 20, closing below even its October 15 crash-day close. On October 21 it rebounded so sharply that a buy sidecar was triggered. It closed up 3.29% at 5,735.66.The first domino (what happened) On October 20 the KOSPI fell 215.27 points (3.73%) to 5,552.74, below its Oct..