The era of true madness that seems absurd looking back

During the market surge, there were many videos claiming the KOSPI would hit 10,000—more so than Sampro—and I suddenly thought of this person who even released a book and made appearances.
When I searched, they appeared in many places through June, but there has been no news since the massive market crash in July.
In a market filled with such madness, when "fly-by-night" experts are everywhere, I remember Center Director Yoon Ji-ho, who told the public what they didn't want to hear: "Sell and secure cash." Since Yoon-sen says to cautiously buy in installments below 6,000, I'm going to try and trust him.