The success of SK Hynix and Samsung helped make South Korea’s stock market one of the world’s hottest in recent years—but also one of the most volatile. WSJ reporter <a href="https://www.wsj.com/finance/stocks/stock-market-crash-south-korea-ai-ccb00cba?mod=WSJ_TNBPOD" target="_self" rel="noopener noreferrer">Jack Pitcher</a> tells us about the “<a href="https://www.wsj.com/finance/stocks/stock-market-crash-south-korea-ai-ccb00cba?mod=WSJ_TNBPOD" target="_self" rel="noopener noreferrer">Rollerkospi</a>,” and what its wild ride could mean for the broader AI trade. Plus, buying a <a href="https://www.wsj.com/tech/personal-tech/refurbished-phones-safety-tips-d3ca0249?mod=WSJ_TNBPOD" target="_self" rel="noopener noreferrer">refurbished phone</a> might save you a few hundred dollars, but it could also come with unexpected problems. Personal tech columnist <a href="https://www.wsj.com/news/author/nicole-nguyen?mod=WSJ_TNBPOD" target="_self" rel="noopener noreferrer">Nicole Nguyen</a> breaks down what to look out for to avoid stress, scams, and spyware. Imani Moise hosts.

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